[Can't be the heat, this problem has occured before.
Installing windows again, or cleaning computer fixed the problem, atleast for half a year.[/quote]
If you fixed it by cleaning it, it may be heat. The ATI cards runs your CPU at 100%. Depending on you CPU cooler that can heat up fast. I also had problems with a memory stick, I had to lower the clock speed in my BIOS to get it stable. Nothing will make you

like working fo hours on a convoy just to have your computer take a dump.