Hi Jan,
Great troubleshooting thus far (including cursing at the machine :)
When did this start happening? Is it a wireless mouse/keyboard combo? Do you have the exact model number (5000, 7000, etc)?
Let’s give windows troubleshooter a shot. Click start, type “troubleshoot” and launch it. Choose Hardware and Devices, run it, then choose Keyboard, and run that one. See if they find anything.
Let’s start here, and we’ll continue troubleshooting.
- C