Hi! Thanks for looking! Ok, here is the deal. Sometimes, when playing Garrys Mod, the game freezes (I cannot move mouse, cannot ctrl-alt-delete) and I have to turn it off on the back. Other times while playing garrys mod, the computer just restarts. No blue screen, no nothing. The screen just goes black, then the HP thing pops up, then it asks if I want to boot windows 7 or vista (I use Vista for playing games. My brother wanted to see what windows 7 was like) The game is updated, Vista is updated and I'm sure all my drivers are updated. I have way better then the recommend specs, and this has never happened to me any time I have played the game. Also, my mom says the same thing happens to her when she plays Facebook games. I looked in my computer and all of the wires look the same, and I cleaned out all of the dust. What do you think this could be? I did the MemTest thing, it said NOTHING was wrong.

sounds like it may be overheating..... try taking the side panel off and placing a small house fan to blow inside. try finding a program to monitor the temps.i cant think of any right now, but someone should suggest one (hint wink nudge to those who read this) so find the temps and post them here when someone suggests a program.

OK guys I got Speedfan. It says "GPU: 77C Temp1; 37C Temp2: 52C Temp3: 25C Temp: 44c Core: 44c"

It has a 8600 graphics card, and the fan part is pointing down, onto the .... I think the TV tuner part? I dunno.