We have a pc that reboots itself at random. Typically, it's when the user has two or three applications running and decides to open another one.

Yes, I realize it would probably be best for her to close one (or two or three) before trying to open another...but you may as well talk to the wall!

I've ran defrag, scandisk, everything (IE, Windows Updates, Antivirus) is up to date.

Any thoughts?

TIA