One thing I did to start off with was to download the most recent Nvidia driver v456.55, yours may be different vendor. I then installed it custom, not express, and had it install FRESH.
This driver for me caused my "explorer.exe" to crash and I had to load Ctrl+Alt+Del, and then File>New Task-RUN and typed in "explorer.exe". Once I had my icons and Start button back, I then restarted my system.

Also, check to see if you Administrator account is enabled. If not, enable it, then give it a password that you know. Sometimes programs do not like to do the "run as admin" if the administrator account is not enabled. Just a thought.

Last edited by captainfish; 07/10/20 03:23 AM. Reason: clarification