Mysterious Blue Screens

[idancesafetydance]

Hello all. For the longest time now I have been getting BSOD's in FS9 for a reason which is unknown. I am running Windows 7 64-bit, but I also encountered these with Windows 7 32-bit. The BSOD's seem to be triggered at random times with the ALT key. Sometimes it triggers the first time I press it, and sometimes it triggers after 2 hours of pressing it, but always at the worst times. Any ideas?

Thanks in advance
-Chuck