I only have a laptop nearby at the moment. I also just did a SFC scan and that did not turn up anything.
Given the fact that the major parts have already been replaced, is there any chance that a hard drive could suddenly give me random reboots and what not? I find it difficult to believe it could go bad after such a period of time, but who knows. Additionally, when I did take this machine back to shop, and had the guy run stress tests on it, he used his own hard drive and each time I took it back for these tests since I kept having problems, he claimed nothing happened during that time.
Another bit of info I recall is after the first time I formatted the hard drive and encountered the problem again, I put Vista 32 bit on a separate partition and had the same issue.