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?!