Parapunter,
Usually the first indication that your OS has been corrupted is Antivirus Programs causing problems with your comp. If you keep having problems with your comp crashing, it might be time to re-install your OS.
Take Care,
Capt. Richard J. Gentil, Pres.
Naples Air Center, Inc.
Custom Computers of Naples, Inc.
P.S. I have fixed many a customer's comp just by removing Norton or McAfee, etc.