My gf has a Dell Inspiron 5100. The computer is ~7 months old. It runs WinXP, it's not used for much more than IM, email, and word processing. Anyway, lately it will just turn off unexpectedly. One will be typing and *BAM* power goes off. I checked the easy stuff, the battery is charged, the AC power is hooked up, I'm not hitting the power off button. I don't think it is overheating as it just sits on a desk for the majority of its use. This happened about 5 times within a 10 minute span about two weeks ago, and it didn't do anything since. I threw on some AdAware, Spybot, ran it through a virus scan, and threw up a firewall courtesy ZA. It just happened again three times in the past five minutes. It did a disk check and said the hard disk was "dirty?" It seems to be fine now. It is quite annoying, even though Windows recovers stuff, very stressful as she is under enough pressure with law school. Couldn't find much in the way of help on the web, and not in the mood to dial tech support.