As per the reports and recent surveys of many forums, users have been confronting this issue where the screen turns blue abruptly with a notification to restart the computer.
Unfortunately, every time you restart the system, the blue screen recurs, again and again, keeping you trapped within this vicious loop.
What is the Cause of BSOD error 0xC000021A?
You cannot ascertain any particular cause for all Windows OS. Yet for this error code 0xC000021A, there are two files which seem to trigger the issue- Winlogon.exe and csrss.exe
- Winlogon.exe– This file is primarily responsible for the login and log out protocols. If they have been damaged, or corrupted then the error might occur.
- csrss.exe- This particular file is accountable for the graphical constructs within the system. If this one gets damaged or corrupted, that too could trigger the issue.
Now if you seriously want to get rid of the error 0xC000021A, read the solution described below. And check if it works for you or not.
Solution #1: Use Startup Repair
If you are completely locked out of your system, then this method will help you login normally again. But you need to have the Windows 10 DVD/CD or any bootable pen drive.
Follow the steps below:
Step 1. Insert the Windows 10 DVD/CD and boot from it. Change the boot preference order if needed from the BIOS settings page.
Step 2. When the first screen appears, click on “Troubleshoot” option.
Step 3. Now on the next screen, choose the “Advanced options” option.
Step 4. Again on the next screen click on the “Startup Repair” option.
Now you have to wait. The Startup Repair will scan your entire system to fix the files or any startup issue. Once the repairing is done, remove the disk and reboot normally.
Solution #2: Fix Corrupt File with CMD
Fixing the corrupt files is the best way of all because it doesn’t alter the existing files and configuration. It is safe and reliable, so you can give it a try.
Just follow the steps instruction outlined below:
Step 1. Like before insert the Windows 10 DVD/CD or bootable pen drive if you have on and boot from it.
Step 2. As soon as the first blue screen of options appears, choose the “Troubleshoot” option.
Step 2. Next, choose the “advanced options” option.
Step 3. On the next screen, click on the “Command prompt” option and the usual black dialog box of cmd will pop up.
Step 4. In the Window, type the command c:/f/r and hit “Enter”. When you get a y/n command in output, type y and hit “Enter”.
Now try to reboot your system. Hopefully, it will reboot perfectly this time.
Solution #3: Disable Driver Signature Enforcement
There is a 99% chance that the last two methods can resolve the issue. But if it is still resurfacing, then prefer this method.
Driver Signature Enforcement ensures that only the chosen drivers dispatched to Microsoft for signing will load into the Windows kernel. Corruption of this feature may at times trigger the error code 0xC000021A.
Read the step guideline, and you will know how to disable the driver signature enforcement:
Step 1. Again boot into your system using the same Windows 10 DVD/CD.
Step 2. On the blue screen, choose “Troubleshoot”.
Step 3. Next, choose “Advanced options”.
Step 4. Now choose “Startup Settings”.
Step 5. Finally, click on the “Disable Startup Enforcement” option and hit the “Restart” button at the corner of the screen.
NOTE: You can also press 7 or F7 keys to disable the driver signature enforcement feature on the “Startup Settings” page.
Check the status of your system and is it is still not resolved then press 8 or F8 to activate the “Disable early-launch anti-malware protection” feature and then restart your machine again.
Most probably the issue will be sorted out this time.
Hopefully till now using the aforementioned solutions you have been able to resolve the BSOD error 0xC000021A issue.
If there are still some doubts regarding the solutions, you can call out for a technician’s help. You can ask the queries in the comment section below as well. You can add some extra information regarding the article in the comment section.
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