[THEBERBSTER]

Hi CA
Sounds like you might have had a Microsoft update.
You should be able to check that your STEAM download is in its correct place.
I am led to believe that the STEAM download comes already updated to v1.2.
You should be able to start a Stock game but first make sure your SH5.exe is setup as an administrator.

Check that your GPU is setup correctly.
Post #239 Changing The Nvidia GPU Settings > Essential Settings > Pictorial
Here is a fix that may make a difference?
Post #412 Override High DPI Scaling Behavior > Pictorial
Peter