How To Fix The Error Code ‘0xc00021a’ Blue Screen In Windows 10 And 8

If you have the error ‘0xC00021A’, please read this guide in which you will learn how to fix the error code ‘0xC00021A’ blue screen in Windows 10 and 8 . Moreover, we have different guidelines for such problems, as in the case of the error ‘verifying Dmi Pool Data’ and many more.

What is the error ‘0xC00021A’

On many occasions it has been said that the error ‘0xC00021A’ files appears when the Winlogon.exe and Csrss.exe system fail. The above files are very important for the proper functioning of Windows, so a failure causes them not to continue using your computer.

error 0xc00021a windows

Resolve error ‘0xC00021A’

  1. First, try a system restore.
  2. chk disk /f /r
  3. sfc /scannow
  4. dism/online/cleanup-image/restorehealth
  5. dism /image:C:\ /cleanup-image /revertpendingactions
  6. Disable Driver Signature Enforcement
  7. Try booting to safemode with networking
  8. Roll computer back to a previous version of Windows
  9. Restore files from RegBack folder ( I have made video on how to do this)
  10. When all else fails try Reset your PC


The Winlogon.exe file complies with very important tasks for Windows, in fact, if you have multiple users on your computer and changes are made, the software intervenes directly. Indeed, Winlogon.exe is responsible for upload the files of each of the profiles of our system, as well as other relevant tasks


The Csrss.exe file appears in Windows since its early versions, today it is said that the control file aspects of Windows console and the shutdown process. Certainly the same functions are very important for the proper functioning of the system.

Causes of error ‘0xC00021A’

One of the main causes of this annoying drawback is the appearance of malicious programs . Viruses are often created specifically to affect executable Winlogon.exe and Csrss.exe, as they pointed out that are indispensable for the proper functioning of the computer before.

In short, the possible cause for the error arising ‘0xC00021A’ is the presence of a virus. Anyway, other causes may be, in fact, also A blackout is capable of certain corrupt files on your hard drive , as the case of those mentioned above.

There are several reasons why this error appears, but no matter what you’re affecting that, you point out some possible solutions to this problem. But first, it is recommended that you clean and hasten your PC with Advanced SystemCare.

error windows 8 10

How to Fix the ‘0xC00021A’ blue screen error in Windows 10 and 8

Here are some of the simpler solutions with which it is possible to fix the error ‘0xC00021A’. Read it carefully to give the solution and stop this blue screen appear so annoying.

Start in Safe Mode

Understanding that this problem usually avoid entering the system, you must boot into safe mode. The process to start in this mode is simple, just turn off your computer directly from the button on the cabinet. Do this process several times.

With this, the Windows Start menu, you will recognize as the typical blue background screen should appear. You must select “Troubleshooting” and then go to the “startup Settings”. After this just click on the button “Restart.”

After this, he will root system in safe mode, here we recommend you uninstall any suspicious software that creates that could cause the problem.

Enable Auto Repair

resolver error windows screem blue

this will create a bootable USB drive with Windows , after making this process, starting directly from the USB. In other words, this process will be similar to the install Windows from scratch , only this time we seek to repair the computer.

Wait until you start the installer and then all you have to do is go to “Repair your computer”. In this section refer to “Advanced Options” and locate the “Auto Repair” . After this process Windows will analyze each of the files that make up the operating system and seek to repair those that could be damaged.

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