Windows 10: Can't upgrade to Windows 10 20H2 to 21H1

I tried to install Windows 10 20H2 via Windows 10 Update Assistant. The Update Assistant restarted my PC, then loaded the lock screen as usual after a longer boot time than usual.

:)

 

Windows 10 upgrade problem, no input accepted

I really hate having to come here and ask for help, but I really am stumped. It hurts my geek pride. I have a PC with fairly modern hardware in it. It has a p8p67 pro in it. I have tried upgrading windows 10 on it twice now. Both times I have had the same result.

After windows finishes upgrading it goes to the log in/set up screen. I can't do anything. No keyboard or mouse input is accepted.

I will list some, or hopefully all, of the troubleshooting steps I have tried:

• Move keyboard and mouse to different USB ports.
• Try different keyboard or mouse.
• Restart computer, repeatedly.
• Google for related issues.
• Update Bios, because why not.
• Create boot media and revert to windows 7.

The windows 10 system restore boot media works fine with keyboard and mouse. All USB ports work in windows 7. I don't know what is wrong. I suspect that windows 10 is lacking a driver of some sort, but since the computer accepts no input I have no way of checking for which driver let alone installing it.

Please help me figure this out. If I have to revert back to windows 7 again, I am not going to get it upgraded to windows 10. Thank you in advanced.

 

KB5004476 Windows 10 2004 19041.1055, 20H2 19042.1055, 21H1 19043.1055 Win Update

Clicking on Task Scheduler Library.
The only mention of Edge in Task Scheduler that I can see I have already disabled.

 

How to get the Windows 10 May 2021 Update version 21H1

so to upgrade from 20H2 to 21H1 has two steps:
1. install EP
2. install update, but which one? for x64 arch. thx