Neelyohara
In all seriousness, it could be bad memory. If you're running vista run the memory diagnostic utility, or download a copy of memtest86 if you're not.
I ran the memory diagnostic but it said that my memory was fine. Hmm...I dont know what else to do. I was thinking it might be a processor error or maybe its just overheating with a cooling bad and a cool room. idk.