How to Fix c000021A Fatal System Error on Windows 10

Fix c000021A Fatal System Error: Microsoft without a doubt pushes updates that will fix the bugs and errors on the Windows 10 operating system. But then again, at times when these updates cause or bring in a lot of issues instead of fixes. One of the most possible errors that you might be facing is the hex code c000021A, which was a very recent issue started appearing ever since Windows users have updated to the latest version of  Windows. For those who are unaware, this error, in general, originates in the form of Blue Screen of Death and it may also damage the internal structure of your Windows OS.

But do note that the occurrence of this particular issue is very much rare and problems may escalate quickly. Not to be scared but it would be super challenging to address the issues too and it is worth noting that a lot of people are reporting online that they are facing the issue. Now, do not worry at all as in this guide we shall discuss How to Fix c000021A Fatal System Error on Windows 10 easily.

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As mentioned earlier, the c000021A error is considered a critical error, and most of the time it is difficult to repair. But not us as in this post we have compiled a list of various methods with a step-by-step process to fix c000021A Fatal System Error on Windows 10. With that said, in this guide let us discuss How to Fix c000021A Fatal System Error on Windows 10.

Error Details:

STOP: c000021A (Fatal System Error)

The Windows SubSystem sytem process terminated unexpectedly with a status of 0xc0000005.

The system has been shut down.

 

The 0xc000021A error is also known as:

STOP 0xc000021A

STATUS_SYSTEM_PROCESS_TERMINATED  (Status System Process Terminated)

HALT: c000021A {Fatal System Error}

STOP c000021A

Why c000021A Fatal System Error Occur?

fix-c000021a-fatal-system-error

  • When the user subsystem processes got terminated or killed, the system gets into the kernel mode. Windows cannot function without the WinLogon or CSRSS, and for that reason, the blue screen error will be displayed.
  • The bluescreen error also pops up when there is a possible existence of the mismatch in files in the hard drive. This also happens after restoring the system from the restore point or any backup in general. The restore program most of the times skips the essential system files and the program assumes that those files are being used by the system,
  • This could also be caused by installing or updating the device drivers or even after installing the third-party applications.

There are various methods that you can try to fix the issue and majorly this issue can be fixed:

  1. By Uninstalling the Problem Software
  2. By Running SFC Scannow Command
  3. By Running DISM Command
  4. By Performing System Restore
  5. By Runnings Cloud Reset

Now, we shall discuss all these aforementioned methods in detail.

Method 1: Uninstall the Problem Software to Fix c000021A Fatal System Error

On any off chances that you have recently installed or updated software or an application that may well be the cause for this error. In such cases, you can uninstall the problematic software to sort the issue.

Step 1: On your computer press Windows key + R from any window to open Run on your computer.

Step 2: Now in the search box on Run, type the following and click on Enter. (You can also copy-paste the below-mentioned to your Run’s dialogue box)

appwiz.cpl

Now, this opens up Programs and Features on your Control Panel. Alternatively, you can also open up Start and search for Control Panel and choose the option for Programs and Features from there.

Step 3: In the Programs and Features and choose Uninstall or Change a program feature and scroll down from the list of all the programs installed on your computer.

Step 4: Now, choose the program and right-click on it, and then choose Uninstall.

Method 2: Run SFC Scannow Command to Fix c000021A Fatal System Error

Step 1: Firstly, boot your computer into Safe Mode using the command prompt.

Step 2: Open the Start menu or search bar on your computer and search for Command Prompt and click to run it as Administrator.
Do note that you will need to run CMD in Administrator mode. So do not open cmd directly in a folder or via the Run application. 

Step 3: Now, type the following command and hit Enter

sfc scannow

This process might take some time to scan and find out the corrupt files.

Method 3: Run DISM Command to Fix c000021A Fatal System Error

Step 1: Again, open the Start menu or search bar on your computer and search for Command Prompt and click to run it as Administrator.
Do note that you will need to run CMD in Administrator mode. So do not open cmd directly in a folder or via the Run application.

Step 2: Now, type the following command and hit Enter

dism /image:C:\/cleanup-image/revertpendingactions

Now, let the process complete and this takes a while to identify issues and repairs them automatically.

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Method 4: Perform System Restore to Fix c000021A Fatal System Error

Step 1: Boot your computer to Safe Mode and then create a system restore point using the command prompt. If the system point is already present, go ahead with the below steps.

Step 2: On your computer press Windows key + R from any window to open Run on your computer.

Step 3: Now in the search box on Run, type the following and click on Enter. (You can also copy-paste the below-mentioned to your Run’s dialogue box)

nstrui

Step 4: It opens up the System Restore window. Now click on Next

Step 5: Now select a Restore Point from the list and click on Next

Step 6: Review the details and press the Finish button to confirm.

Accept the prompt when asked and after some time you will get to System restore completed successfully.

Method 5: Run Cloud Reset to Fix c000021A Fatal System Error

Step 1: On your Windows, open the Settings application which you can find in the bottom left corner of the Start Menu.

Step 2: Once the Settings page is opened, click on Update and Security.

Step 3: Next up click on the recovery option which is found on the left side of the panel.

Step 4: Moving on choose Reset this PC option and click on Get Started

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Step 5: In the next window, click and choose on Keep my files and remove everything based on your requirement.

Step 6: In the next window, click and choose the Cloud Download options.

Step 7: Press Reset to confirm and now let the process complete.

Conclusion

Now, this is our take on How to Fix c000021A Fatal System Error on Windows 10. If this guide helped you to fix c000021A Fatal System Error on Windows 10 easily, do consider sharing this guide with your friends and users who are facing this issue. We at RootUpdate strive to bring you the latest Android, Windows, and Gaming guides and news every day. If you are interested in more posts like this one, do consider clicking on the red bell icon on the bottom left corner of your display to enable notifications. If you already did, sit back and relax. We will notify you each time we post a new article.

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