[Fix] 0xC000021A Blue Screen Error On Windows

The 0xC000021 Blue Display screen error (BSOD) has the Bug Verify code WINLOGON_FATAL_ERROR and the ntstatus code STATUS_SYSTEM_PROCESS_TERMINATED.

Winlogon.exe is the system file chargeable for logging within the person to an account and establishing the person profile. So, this BSOD error normally happens when this course of terminates unexpectedly. Nonetheless, it may additionally happen when different crucial processes, reminiscent of Consumer Server Run-Time Subsystem (csrss.exe), expertise the identical problem.

Customers primarily encounter this error after updating/upgrading their system or restoring it from a backup in the event that they encounter any points in the course of the course of. On this article, we clarify all of the doable causes for the error together with the doable options.

What Causes 0xC000021A Blue Display screen Error

How to Repair 0xC000021A Blue Display screen Error

There are a number of doable fixes for the 0xC000021A BSOD error, which we now have offered under. Now we have ordered these options based mostly on their relevance and comfort. So we advocate you apply them in the identical order.

Additionally, a few of these strategies require you to get to Windows Recovery Setting or Superior Startup. As well on this mode,

1. Power shut down your PC by urgent the facility button for a number of seconds, then energy it up once more.
2. Repeat this step three more instances, till you get to a blue display screen.
3. Right here, click on on Superior choices.

Disable Driver Signature Enforcement

In case you get caught in a BSOD loop with the above cease code, the very first thing you must do is disable driver signature enforcement. If a few of your drivers are failing signature enforcement, it is possible for you to besides into Windows by disabling this function.

Then, you may both disable it completely or carry out different troubleshooting strategies. The enforcement is a safety function to guard your system so we don’t advocate disabling it completely.

Regardless, right here’s how one can disable it:

1. Get to Superior Startup choices.
2. Go to Troubleshoot > Superior choices > Startup Settings > Restart.
3. Press F7 or 7 after you see the startup settings display screen.

Deciding on this feature solely disables the enforcement quickly. So you must do the method each time you boot. To completely disable it,

1. Open Run by urgent Win + R.
2. Kind cmd and press Ctrl + Shift + Enter to open the Elevated Command Immediate.
3. Enter the command under:
   bcdedit /set nointegritychecks on
   

You can too enter this command on the Superior Startup’s Command Immediate (Troubleshoot > Superior choices > Command Immediate)

Revert Pending Actions

It is usually doable that some pending system operations have change into corrupt, inflicting a system course of to cease unexpectedly. This problem happens particularly after a failed system update.

In such circumstances, in case you get caught in a startup loop, you must take away these pending duties to resolve the error.

Right here’s how you are able to do so:

1. Entry the Superior Startup Choices and go to Troubleshoot > Superior choices > Command Immediate.
2. Enter the command bcdedit
3. Underneath Boot Loader, examine the drive letter subsequent to osdevice. It is likely to be totally different than the drive letter you see after logging in to Windows. In our case, we use the letter C:
   • dism /picture:C: /cleanup-image /revertpendingactions
   • cd C:WindowsWinSxS
   • ren pending.xml pending.previous

Update Drivers and System

Defective drivers are among the essential errors for a lot of BSOD errors, together with this one. So, we advocate updating all of your drivers to the newest model to stop any compatibility and corruption points. To update your drivers,

1. Open Run and enter devmgmt.msc to open the System Supervisor.
2. Increase the gadget classes.
3. Proper-click on the gadget and choose Update driver > Search robotically for drivers.
   

We advocate updating all doable drivers. You can too obtain the newest updates from the official web sites and set up them.

It’s additionally higher to update your system to the newest model. Many customers have encountered this problem in earlier Windows variations as a result of system bugs. Microsoft repeatedly releases bug fixes for such errors, so update Windows as quickly as you may. Right here’s how you are able to do so manually:

1. Open Run and enter ms-settings:windowsupdate to get to Update Settings.
2. Click on on Verify for updates to seek for obtainable system updates.
3. If the updates can be found, click on on Set up now or Obtain and set up (for non-compulsory updates).

Uninstall Current Software program/{Hardware}

Incomplete set up of a software program program, together with gadget drivers, is among the essential causes of this problem. Moreover, it may additionally happen if the software program or the gadget just isn’t suitable together with your system.

In case you lately put in any new {hardware} in your system, you may take away them and examine in case you nonetheless encounter this error. In case you do, then first, update or roll again these units’ drivers. If the problem persists, you must substitute them.

Equally, it’s also possible to search for incompatible software program. We advocate uninstalling any lately put in software program and looking for any recurrence of the BSOD. If it does, examine on the official web site for any compatibility points and apply the prescribed troubleshooting methodology. If not, reinstall them and transfer on to successive options.

To uninstall the functions,

1. Open Run and enter appwiz.cpl to load Applications and Options.
2. Choose the lately put in software program and click on Uninstall.
3. Observe the on-screen directions.

Restore Corrupted Information

One other doable answer is to restore the integrity of your system information. Since this error happens as a result of your system processes, particularly winlogon.exe terminates abruptly, you may’t disregard system corruption.

Right here’s how one can restore your system information in addition to system drive sectors:

1. Open the Elevated Command Immediate
2. Enter the next instructions:
   • dism /on-line /cleanup-image /restorehealth
   • sfc /scannow
   • chkdsk /r /x C:
     

In case you get caught in startup loop, entry the Superior Startup’s Command Immediate and carry out the next steps:

1. Enter the command bcdedit
2. Underneath Boot Loader, examine the drive letter subsequent to gadget and osdevice. It is likely to be totally different than the drive letter you see after logging in to Windows. In our case, we use the osdevice drive letter D: and gadget drive letter E:
   
3. Then, enter the next instructions:
   • dism /picture:D: /cleanup-image /restorehealth
   • sfc /scannow /offbootdir=E: /offwindir=D:Windows
   • chkdsk /r /x D:

Scan for Malware

Some malware scripts can even have an effect on the system course of and trigger this problem. In such circumstances, you may have the ability to resolve the BSOD by performing the above strategies. Nonetheless, you gained’t have the ability to cease it from occurring once more.

To take action, you must use an antivirus program to scan such malware. Right here’s how you are able to do so utilizing the built-in Windows Defender or Safety:

1. Open Run.
2. Enter ms-settings:windowsdefender to open Windows Safety Settings.
3. Go to Virus & menace safety and choose Scan choices.
4. Verify Full scan and click on Scan now.

Verify Occasion Viewer

The following methodology you may strive is to examine the occasion logs to research the precise cause for the BSOD. The Occasion Viewer shops all of your system logs that embody the total description of the duties the system carried out or did not carry out together with the explanation.

Right here’s how one can examine the occasion viewer for the BSOD log:

1. Open Run and enter eventvwr to open the Occasion Viewer.
2. Increase Windows Logs and click on on System.
3. Click on Filter Present Logs from the appropriate sidebar.
4. Click on the drop-down icon on the Occasion sources.
5. Scroll right down to and choose BugCheck, after which click on OK.
   
6. Verify the outline of the newest occasion log and likewise observe down its time.
7. Then, choose Filter Present Logs once more.
8. Click on Clear after which OK.
9. Then, seek for all of the occasions that occurred on or close to the time you famous.

Understanding which processes skilled a difficulty throughout this time ought to assist slender down the file concerned.

Then, you may carry out the related troubleshooting steps. If some system information are accountable, you may strive changing them from a working system or the web.

Clear Boot System

This BSOD error can even happen when some third-party processes intrude together with your system processes and trigger them to cease abruptly.

In case you had been in a position to decide the wrongdoer utilizing the occasion log, you may troubleshoot simply that course of. Nonetheless, in case you failed to take action, you must clear boot your system to slender down the accountable course of.

1. Open Run and enter msconfig to open System Configuration.
2. Go to the Providers tab.
3. Verify Hide all Microsoft companies and click on Disable all.
   
4. Choose Apply to save lots of the modifications.
5. Go to the Startup tab and click on Open Process Supervisor.
6. Choose every program and click on Disable.
   

Restart your system after disabling the non-Microsoft processes and companies.

• After the reboot, periodically allow the person companies and applications and restart your system once more.
• If the BSOD happens on this boot, the service/course of you enabled is chargeable for the problem.
• Carry out this process for all of the processes and companies to isolate all problematic apps.

Then, you may update, reinstall, or disable such functions to resolve the blue display screen error.

Restore or Reset Windows

If the earlier options weren’t efficient, you must restore or reset your system. You probably have a restore level for a latest time the place you didn’t expertise this error, you must revert to that state. To take action,

1. Open Run and enter rstrui to provoke System Restore
2. Choose an acceptable restore level and comply with the given directions.

In case you get caught in a startup loop,

1. Boot into Windows Recovery Setting.
2. Go to Troubleshoot > Superior choices > System Restore.

In case you don’t have any acceptable restore level or this methodology fails, you must reset Windows to the default state.