A Quick Guide to Fixing the Stop C00002lA Fatal System Error

Stop C00002lA Fatal System Error Repair

Stop C00002lA Fatal System Error- What is it?

C00002lA Fatal System Error is a blue screen of death error that may occur when you start your Windows NT 4.0 based computer. This error causes the screen to turn blue and the system also shuts down.

The stop C000021A error message is displayed in the following format:

Stop c000021a {Fatal System Error}
The session manager initialization system process terminated unexpectedly with a status of 0xc0000017 (0x00000000, 0x0000000) The system has been shut down.

Error Causes

The stop C000021A error occurs when either Crsrss.exe or Winlogon.exe fails. When the Windows NT kernel identifies that either of these processes has failed, it stops and the error code stop C000021A appears on the computer screen.

Here are some of the underlying causes for the stop C0000021A error:

  • The incompatible third-party program
  • Hard disk issues
  • Service pack installation has failed
  • Mismatched system files have been installed
  • Bad and invalid registry keys

Further Information and Manual Repair

To resolve the stop C000021A Fatal System Error on your PC try the following solutions:

  • Remove Incompatible Third Party Programs

If the error occurred after you recently installed a new program, then it is advisable to remove that program. The error occurs due to the incompatibility of the program.

To remove the program go to the start menu and click on the control panel. Now click on Add/Remove Program tab and double click on the program name that you recently installed and remove it from the list.

Once removed, not reboot your PC. Reinstall a compatible program and run it. It is most likely to resolve the issue. However, if the stop C000021A error still occurs, then it means the problem is critical. It is related to the registry.

  • Repair and Restore the Registry

This procedure is slightly long and tricky.

To try it, you need to be technically sound. Here’s what you have to do: first create a parallel installation of Windows NT.

Start your PC to the parallel installation and then open the Registry Editor. On the Registry Editor’s Windows menu click HKEY_LOCAL_MACHINE on Local Machine and then click Load Hive.

Now type the path %systemroot%system32configsystem into the System hive of the prior installation. Then click open. Here you will be prompted to enter the name of the key, type TEST.

Note the setting for the current DWord value in the preceding registry key. This is 0x1 and is denoted by CURRENT:Reg_Dword: 0x1.

This value indicated that the Current Control Set for your original Windows NT installation corresponds to ControlSet001 in this window. Now if the value is 2, it indicated that the Current Control Set corresponds to ControlSet002.

Now locate the following registry key:

HKEY_LOCAL_MACHINETESTControlSetXXXControlSession Manager. XXX is the Current Control Set Value. And delete any pending file rename operation entries. Then click TEST hive and then click Unload Hive. After that again repeat the process, open the registry menu and click load hive, here type the path %systemroot%system32configSoftware to the Software hive of the prior installation and then click open.

Now you type TEST 2 when you are prompted for the name of the key. Remove any pending file rename operations entries in the following registry keys:

HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnce

HKEY_LOCAL_MACHINETEST2MicrosoftWindowsCurrentVersionRunOnceEx

Now click TEST2 hive and then click unload hive. Quit the Registry Editor and then restart your original installation.

This will resolve the stop C000021A error.

Congratulations, you have just fixed Stop C00002lA Fatal System Error In Windows 10 all by yourself. If you would like to read more helpful articles and tips about various software and hardware visit errortools.com daily.

Now that’s how you fix Stop C00002lA Fatal System Error In Windows 10 on a computer. On the other hand, if your computer is going through some system-related issues that have to get fixed, there is a one-click solution known as Restoro you could check out to resolve them. This program is a useful tool that could repair corrupted registries and optimize your PC’s overall performance. Aside from that, it also cleans out your computer for any junk or corrupted files that help you eliminate any unwanted files from your system. This is basically a solution that’s within your grasp with just a click. It’s easy to use as it is user-friendly. For a complete set of instructions in downloading and using it, refer to the steps below

Perform a full system scan using Restoro. To do so, follow the instructions below.

      1. Download and install Restoro from the official site.
      2. Once the installation process is completed, run Restoro to perform a full system scan.
        restoro application screen
      3. After the scan is completed click the “Start Repair” button.
        restoro application screen
If you like to learn and find out more about various Windows errors, and how to repair them go to our vast archive or use search to find articles that will explain and help you in solving your issue.
However, if you prefer to do things fast and with automatization then we are proposing to use an automated solution for your issues. The application that we are recommending is Advanced System Repair Pro
Advanced System Repair utilizes multiple tools all in one to give you a quick, simple, reliable, and very thorough diagnosis of your PC. It brings you all the tools you need in one program to clean, fix, protect, optimize and boost your PC!
1-Click Maintenance
All the tools to make it simple and easy! It's like having a professional technician at the click of a mouse.

Junk Cleaner
Keeping your computer free from unnecessary clutter also helps make your computer last longer. Like any other machine, if you keep it clean and take care of it, it will serve you better for longer!

Optimize background apps
Optimize applications background activity with the built-in Application Optimizer feature.

Disk Defrag
With a simple 1-click, Advanced System Repair speeds up your PC by assembling fragmented files on your machine and organizing them more efficiently.

Malware Removal
Finds and removes all types of harmful malware including trojans, worms, bots, adware, spyware, PUPs, and more!

Privacy Cleaner
The all-in-one privacy suite to Clean Your Tracks & Protect Your Privacy! Make your computer safe, secure, and more efficient!

System Tweak/Optimizer
ASR will analyze your complete system and settings to adjust your PC to function at its maximum performance.

Registry Cleaner
Over time, as you install and uninstall applications, the registry can become cluttered with old entries and broken settings which can result in program crashes, and annoying messages and slow the computer down.
Visit our Advanced System Repair Pro Download page to inform yourself about all the benefits of this software and get a free trial copy of it.
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Enable Touch Keyboard in Windows 11
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APC_INDEX_MISMATCH  - What is it and how to fix it?
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Option 1 – Try to flush the Socket Pool

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Option 2 – Try to change the DNS Server

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Option 3 – Get rid of any conflicting browser extensions

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Option 4 – Try to reset Google Chrome

Before you proceed, make sure that the Chrome browser is not running anywhere in the background via Task Manager. Once you’ve made sure that it’s no longer running, refer to these steps:
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Option 1 – Check your VPN

When you install a virtual machine or VPN software on your computer, a new setup will be added in the Network Connection settings and helps your computer in using that adapter setting each time the VPN is turned on. Assuming that you are using an Ethernet connection but your system is trying to use another adapter or settings, that’s when issues occur and one of them is the “Windows is still setting up the class configuration for this device” error. To fix it, you can try to disable your VPN temporarily and see if the error is resolved or not and if turns out that your VPN is the culprit, you have to uninstall it and install a new one or its latest version. To uninstall it, follow the steps below.
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Option 2 – Try to update or rollback or uninstall the Network Adapter drivers

You might also want to update, roll back or disable your Network drivers to fix the “This operation failed as no adapter is in the state permissible for this operation” error.
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Option 3 – Try to run the Network Adapter troubleshooter

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Option 4 – Try to reset the Network

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How to Manually Fix 0x8004210A Error Code on Your System

Repair 0x8004210A Error Code

Error 0x8004210A - What is it?

0x8004210A is a typical POP3 email error message. This error may sometimes occur when you try to check your Post Office Protocol 3 (POP3) email account. 0x8004210A error code hampers your ability to both send and receive e-mails on your Outlook account. Error 0x8004210A is displayed in any one of the following formats on your PC:
The operation timed out waiting for a response from the receiving (POP) server 0x8004210a Task 'SMTP server name - Sending and Receiving reported error' (0x8004210A): 'The operation timed out waiting for a response from the receiving (POP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

Error Causes

Error 0x8004210A occurs due to several reasons. However, some of the most common reasons include:
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  • You are sending and receiving large series of emails or large email attachments
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No matter what the cause of this error is, to resume email communication via Outlook and to ensure your work productivity is not affected, it is recommended that you resolve this 0x8004210A error code on your PC immediately.

Further Information and Manual Repair

To fix error 0x8004210A, here are some of the most efficient and easy manual methods that you can try:

Method 1

If the cause of the error is related to the internet connection then here’s what you need to do. Try freeing up your internet connection by closing any other online activities in progress or downloads being carried on your system.

Method 2

Try to increase your server time-out periods. To do this, go to the Outlook File menu and choose account settings. Now double click on your email account and more settings. Now click advanced and increase your server timeout period to resolve.

Method 3

If you are trying to send or receive large and heavy emails on your Outlook account, the error 0x8004210A may pop up. This happens because when transferring heavy files the email account automatically locks until the task is complete, however, if it takes more time the next Send and Receive job starts while the first one is still not complete. In such an event, the email server then times out and shows you the error. Therefore to resolve, you will have to show patience. Simply wait for the large email to be sent or received before you start sending another email.

Method 4

If the antivirus installed on your system is the reason for the error pop up, then disable it for a while until the operation is complete. Then enable it once the task is performed successfully.

Method 5

Similarly, if the Firewall installed on your system is preventing Outlook from reaching your mail server, then simply disable the Firewall to resolve. Congratulations, you have just fixed 0x8004210A Error Code in Windows 10 all by yourself. If you would like to read more helpful articles and tips about various software and hardware visit errortools.com daily. Now that’s how you fix 0x8004210A Error Code in Windows 10 on a computer. On the other hand, if your computer is going through some system-related issues that have to get fixed, there is a one-click solution known as Restoro you could check out to resolve them. This program is a useful tool that could repair corrupted registries and optimize your PC’s overall performance. Aside from that, it also cleans out your computer for any junk or corrupted files that help you eliminate any unwanted files from your system. This is basically a solution that’s within your grasp with just a click. It’s easy to use as it is user-friendly. For a complete set of instructions in downloading and using it, refer to the steps below Perform a full system scan using Restoro. To do so, follow the instructions below.
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If when hovering over the upgrade icon on the taskbar you get:
Your version of Windows 10 would reach the end of service soon, Click to download a newer version of Windows 10 to stay supported. or An unsupported version of Windows will no longer receive software updates from Windows Update. These updates include security updates that can help protect your PC from harmful viruses, spyware, and other malicious software which can steal your personal information. Windows Update also installs the latest software updates to improve the reliability of Windows—such as new drivers for your hardware.
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  1. Run setupdiag

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    • \$Windows.~bt\sources\panther
    • \$Windows.~bt\Sources\Rollback
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  2. Edit TargetReleaseVersionInfo Registry key

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Many Windows 10 users use a Bluetooth headset as these kinds of Audio devices, as you know, lack wires since wires tend to get entangled and break which could get quite inconvenient. This is why using a wireless headphone is more preferable since it’s much simpler, however, using a wireless headphone also means it comes with a charging requirement and if it fails to charge, there is no music or audio or anything that you need a Bluetooth headphone for. However, wireless headphones are also susceptible to problems as you might encounter some problems when connecting your wireless headphone to your Windows 10 computer. One of these problems include when you try to get sound from the wireless device but nothing happened. This indicates that the Bluetooth headphone is disconnected in some way for some unknown reason even if you’ve already plugged it in. Thus, if you encounter this scenario, then there are several options you need to check out to fix the problem. To start troubleshooting the problem, here are the options you need to use as a reference.

Option 1 – Try turning off the device and turning it back on

The first thing you can do to resolve the problem is to turn off your wireless audio device and wait for a couple of seconds before you turn it back on. In most cases, this should fix the problem. In fact, you can also try to unpair and pair the Bluetooth audio device and see if it fixes the problem or not.

Option 2 – Try to set the headphone as the default device manually

There are times when you plug a headphone, it does not toggle the default audio device. Thus, to fix this issue, you have to set the default audio device to the headphones manually. To do that, follow these steps:
  • First, right-click on the volume icon located on the system tray.
  • Next, select the Open sound settings option to open the Sound section in the Windows 10 Settings app.
  • After that, go to the Output section and select Headphones for the “Choose your output device” option. This should fix the problem for you.

Option 3 – Try running the Bluetooth Troubleshooter

As you know, Windows 10 has various troubleshooters with user-friendly interfaces where you can utilize them to fix issues in your PC. And since you’re dealing with some Bluetooth problem, you have to run the built-in Bluetooth Troubleshooter. To do this, follow these steps:
  • Open the Windows 10 Settings.
  • Then go to Update & Security > Troubleshoot.
  • You should find the option for Bluetooth on your right-hand side – click on it then click on the “Run the troubleshooter” option.
  • Now follow the next screen options.

Option 4 – Try to update or reinstall the Bluetooth driver

The issue might have something to do with the Bluetooth drivers. It could be that it is outdated and needs to be updated or that you recently updated it and since then you have trouble in removing the Bluetooth devices and so to fix the issue, you can update, roll back or uninstall the Bluetooth drivers. How? Follow the steps below.
  • Tap the Win + X keys to open the Device Manager.
  • Next, look for the Bluetooth device and right-click on it.
  • Select the option “Update driver”.
  • After that, a new popup window will appear. In there, select the option, “Search automatically for updated driver software”.
Note: Checking the update may take a few minutes so you’ll have to wait until it finishes. If it is able to find an update, you must install it. And if you want to reinstall the Bluetooth driver, just select the “Uninstall driver” option and follow the next on-screen instructions that follow.
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It is a fact that Blue Screen of Death errors can give you a headache for you will have a hard time fixing it as it is one of the most difficult errors you can encounter on your Windows computer. One of these BSOD errors is the UNEXPECTED KERNEL MODE TRAP error. If you receive this kind of error then it means that the operating system was not able to catch a trap or an exception generated by the CPU. This BSOD error has an error code 0x00000007F and indicates that the Intel CPU generated a trap that the kernel failed to catch. One of the most likely causes is hardware failure due to faulty memory. Aside from this cause, you also have to track down other probable causes for this problem like corrupted system files, incompatible drivers or programs, faulty hardware, and even dusty components, and so on. To fix the UNEXPECTED KERNEL MODE TRAP BSOD error, here are some suggestions that might help.

Option 1 – Uninstall the programs you installed recently

Chances are, some programs that you just installed might be the one that’s causing the BSOD error. Thus, you need to uninstall the program to resolve the problem.
  • In the search box, type in “control” and then click on Control Panel (desktop app) among the search results.
  • After that, select Programs and Features from the list which will give you a list of all the programs installed on your computer.
  • From there, look for the concerned program and select it and then uninstall it.
Note: If you have downloaded the app from the Windows Store, you can simply right-click on it from the application list and then uninstall it. In addition, you might also want to check the hardware components of your computer that might not support the operating system itself. You can disconnect all the external devices like USB drives, scanners, printers, etc., and then reboot your PC. After that, add the devices again one after the other and check if the BSOD error is now fixed or not. Moreover, you can also perform a clean boot to make things easier for you.
  • Log onto your PC as an administrator.
  • Type in MSConfig in the Start Search to open the System Configuration utility.
  • From there, go to the General tab and click “Selective startup”.
  • Clear the “Load Startup items” checkbox and make sure that the “Load System Services” and “Use Original boot configuration” options are checked.
  • Next, click the Services tab and select the “Hide All Microsoft Services” checkbox.
  • Click Disable all.
  • Click on Apply/OK and restart your PC. (This will put your PC into a Clean Boot State. And configure Windows to use the usual startup, just simply undo the changes.)

Option 2 – Update your device drivers

  • Tap the Win + R keys to launch Run.
  • Type in devmgmt.msc into the box and tap Enter or click OK to open the Device Manager.
  • After that, a list of device drivers will be displayed. Look for the device driver you and then select either “Update driver” or “Uninstall device”. And if you find any “Unknown device”, you need to update it as well.
  • Select the “Search automatically for updated driver software” option and then follow the instructions to complete the process.
  • If you have chosen to uninstall the driver, follow the screen options to complete the process and then restart your PC.
  • Connect the device and Scan for hardware changes – you can see this option under Device Manager > Action.

Option 3 – Use the Blue Screen Troubleshooter

The Blue Screen troubleshooter is a built-in tool in Windows 10 that helps users in fixing BSOD errors like UNEXPECTED KERNEL MODE TRAP. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:
  • Tap the Win + I keys to open the Settings panel.
  • Then go to Update & Security > Troubleshoot.
  • From there, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.

Option 4 – Run the Windows Memory Diagnostic tool

You can use the Memory Diagnostic tool in Windows to check RAM. Before you use this tool, make sure you save all your important work.
  • Tap the Win + R keys to open the Run dialog box.
  • Next, type in “mdsched.exe” in the field and hit Enter to open Memory Diagnostic.
  • After that, the Windows Memory Diagnostic will give out two options such as:
  1. Restart now and check for problems (recommended)
  2. Check for problems the next time I start my computer
  • Select any of the given options. After that, your computer will restart and check for memory-based issues upon the restart. If there are any issues, it will automatically them.

Option 5 – Disable Memory caching in the BIOS

You can also disable memory caching in the BIOS to fix the UNEXPECTED KERNEL MODE TRAP error.
  • Open the BIOS Setup screen.
  • Next, go to Advanced > Cache Memory and then disable it.
  • Tap the F10 key to save the changes made and restart your computer.

Option 6 – Run System File Checker

  • Tap Win + R to launch Run.
  • Type in cmd in the field and tap Enter.
  • After opening Command Prompt, type in sfc /scannow
  • Restart your computer once the scan is completed.

Option 7 – Clean your hardware components for dust

Cleaning your computer’s hardware components for dust might also help in resolving the UNEXPECTED KERNEL MODE TRAP error. Make sure to use a soft cloth in cleaning the hardware as well as a small blower. Moreover, ensure that you do not damage any parts with moisture or cause harm to any circuits while you’re at it.
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Where can you get computer viruses & malware
From their infant stages to modern days, computer viruses were always kind of here. From simple ones that were annoying with playing speaker sounds and throwing messages on screen to more malicious ones capable of deleting and encrypting files. In today's modern world it is very important to protect yourself, modern viruses are not a joke anymore and they are aimed to create serious damage to computer systems. Where can you get computer viruses & malwareThey can encrypt files in order to make you pay for a decrypter, they can straight up delete files or even cause some hardware damage. Like mentioned before protecting yourself is important, but protecting does not mean only having antivirus software installed, information, where are common places in which they lurk and could be picked up, is also very important. That is why we are exploring in this article the most common place where you can pick viruses or other malware.

Downloading Programs

Programs that contain the downloadable files are the commonest source of malware such as freeware, worms, and other executable files. Whether you download an image editing software, a music file, or an e-book, it is important to ensure the reliability of the source of the media. Unknown, new, or less popular sources should be avoided.

Pirated or Cracked Software

Are you aware of software cracking? Well, every time you open cracked software, your antivirus software might flag it as malware as the cracks consist of malicious scripts. Always say “No” to cracks as they can inject malicious script into your PC.

Email Attachments

Anyone can send you an email attachment whether you know them or not. Clicking on unknown links or attachments can harm your device. Think twice before clicking anything and make sure that file type is not ‘.exe’.

Internet

One of the easiest ways to get a virus on your device is through the Internet. Make sure to check the URL before accessing any website. For a secured URL always look for ‘HTTPS in it. For example, when you click videos published on social media websites, they may require you to install a particular type of plug-in to watch that video. But in reality, these plug-ins might be malicious software that can steal your sensitive information.

Booting Data from Unknown CDs

Malicious software can get into your device through an unknown CD. A good practice to be safe from malicious infection is to remove CD when your device is not working at all. Your system could reboot the CD if it is not removed before switching off the computer.

Bluetooth

Bluetooth transfers can also infect your system, so it is crucial to know what type of media file is being sent to your computer whenever a transfer takes place. An effective armor would be to allow Bluetooth connectivity with only known devices and activate it only when required.

Unpatched Software

Often overlooked, unpatched software is also a leading source of virus infection. Security holes in software are exploited by attackers and are unknown to software makers until the attackers release them in the form of zero-day attacks. It is therefore recommended to install software updates as soon as they are available on your PC.
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