Hi BSturm531,
Thank you so much for the update. I really appreciate it.
You may try enabling the hidden administrator account of the system and see if it works there.
Open cmd with admin rights. Type in: net user administrator /active:yes then press Enter.
Switch to that Administrator profile and see if that makes any difference.
If this does the same thing, you may need to download and install the latest mouse driver from the computer manufacturer's website since you already tried updating it from the Device Manager.
Sid