So, as I understand, things are much better in Safe mode, right?
At this point, I'll ask you to open a new topic at the Windows 11 Forum, describing exactly the issues you are dealing with.
Say that:
1. We checked and cleaned the system.
2. We removed remnants from Avira and Avast, as well as other remnants of programs which are no longer installed.
3. We checked the disk and there is no issue with it.
4. We performed an in-place upgrade.
The computer is clean now, so no need to move on in the Malware Removal Forum. I believe something is wrong with drivers, but this is not my area of knowledge. So, someone in that Forum will assist you.
I'll be watching the new topic.