It's a good idea to run something like
Ccleaner to fix registry stuff once in a while.
http://www.ccleaner.com/
You might want to try a memory diagnostic, it
may be hardware,
http://oca.microsoft.com/en/windiag.asp
but I'd suspect a driver, maybe run windows update.
or run sfc /scannow to check for corrupt system
files (if you have the windows CD).
http://www.updatexp.com/scannow-sfc.html
