Quote (Werewulf @ Aug 21 2011 07:08pm)
does it actually restart or just turn off? could it be overheating?
^This. Open your computer, dust it off with compressed air, make sure all your fans are on. It could be any sort of hardware issue but the simplest solution is usually the best.
There's very few trojans out there that can do this to a computer and so long as you're not a moron who clicks on everything, the chances are pretty low that you obtained one.
Let us know results.