I read somewhere here in the Toms forums that a few of the causes of a shutdown may be from a dirty computer (which I have cleaned it out) and junk stuff. Can anyone out there recomend a FREE good pc cleaner? My husbands computer frequently shuts down, sometimes when you in the middle of doing something. I do have security on it (AVG) preform scheduled maint daily and clean out the cookies and stuff weekly. When it shuts down and I restarted it starts checking stuff in the bios then goes to windows for startup. I'm hoping that it is something as simple as a good pc cleanout.