Fix error 0xc000021a Windows 10

Hopefully this is the right place to be asking this question, I'm desperate so any help is appreciated anyway.

My work computer is currently stuck in a blue screen reboot loop displaying error 0xc000021a. So far everything I have tried hasn't fixed it.

I believe this has happened by an update for Windows 10 which I have been getting notifications to install for a long time. Last night we had a power cut and I left my PC on the login screen so I think it may have automatically installed the update.

The error is something to do with the windows login service or cross.exe from what I have read.

I have tried: going back to a restore point, all restore points have now vanished. Running SFC /scannow. Booting in safe mode. Disabling driver signature enforcement. Startup repair. Resetting windows.

All of these lead to errors and the PC booting back to that same bluescreen loop.

What can I do?!

I've faced this issue before. It's one of the blue screen of death errors. Im sharing 5 steps that will help you fix Error 0xc000021a

One of the following step will sort out the problem:

1. Repair corrupted system
2. Boot window manually
3. Resetting computer's BIOS
4. DO SFC scan
5. Troubleshoot to fix automatically