Yeah, I'll just be sitting here, surfing the net, minding my own business, and *click* it's restart time. Sometimes it restarts before I even get a chance to log on the net, or do anything for that matter. When the desk check runs after the reboot, it usually brings up some files (mostly temporary internet files) and says, "first allocation unit is not valid. The entry will be truncated." Any idea what could be causing this odd problem? Oh by the way, I'm running Windows XP Home on a Dell Dimension 4300. I've got plenty of free hard-drive space and RAM, so those aren't the problems.