I have a laptop by HP, and I'm running Windows XP in case that makes any difference.

In the last few weeks, whenever I'm watching a DVD with Windows Media Player, or using ZSNES, at random my computer will just shut off. There's no consistant time of usage before this happens; sometimes (rarely) I can get through a movie, sometimes I get through the opening credits.

Ran a virus scan, it came back clean.

I'm not sure what else it could be. I usually have it plugged in, so, I don't think it's a battery issue.

Anyone have any ideas? =\