How to Fix Blue Screen Error Code 0xC000021A in Windows 10/11?

Are you able to get into advanced options?

Hello, I am getting this same error code, the only thing that the computer will do is restart over and over, it will not allow me to get into anything else, restore mode will not come on either, it shows on the screen for a brief second, then the blue screen shows up again, and restarts. it will not even let me do anything with boot cd, its like its not even there.
please help

Please submit this as a new question on equestions.net so i can assist you directly; and if needed connect remotely to check.

The idea of W 7 was to go back to that. Unfortunately, W10 ISO gave me the same error.

You can download Windows 7 ISO. You can also download Windows 10 to repair/run. BUT the error mentioned in this guide is for Windows 8 and 10. Can you open a new with your exact issue on eQuestions.net/ask - i will be able to assist you one to one.

Do you have another computer to create installation media?

How are we supposed to follow a link to run a scan on a PC that won’t boot

KEven worse now. Not only can I not boot into safe mode, but I don’t get the advanced options screen, either. I’m in a quandary.

Windows is just a crap now… It just turn bad alone…

Make sure you take a full backup of your important data before performing a clean install.

It’s the same I have, did you find out what it was?

Can you ask this as a new question on eQuestions.net/ask so i can assist you directly.

Hello, I have tried the first method. Unfortunately, it does not seem to work at all. Once I pressed f7 my pc restarted but the problem still remains.

this helped me and was much more thorough.

Hello, neither of the proposed solutions worked, I have even looked up on all other possible solutions but none of them seemed to work, even with command prompt, any better ideas anyone?

This worked for me. It occurred after I have had Win10 running fine since it was released five months ago. Then, AVG did an update, and that’s what screwed it up. By following the F7 technique above, I got mine working find again. Also, WIn10 was attempting to update at the same time as AVG, so that may have caused it. It is fine now. System Restore did nothing.

Are you able to boot into safe mode if you start with the installation media? If this is a desktop, i’d suggest removing the cd/dvd drive, and the wi-fi card/adapter it it’s external. Once you boot into the computer, there will be dmp file in C:windowsminidump which will have more details about the BSOD which we can diagnose. You’ll need to upload it to eQuestions.net