Windows 7 restarts, or attempts to, randomly(64Bit)

I'll try running the event viewer next time I experience a restart. One didn't happen while I was at school today; just going to show that it occurs at random intervals
I don't think that the issue is malware because I have a decent anti-virus/spyware/malware program that scans emails and web pages and all that jazz (Avast!) and I also routinely scan with Spybot Search and Destroy. Spybot immunizes your browsers against malware as well.
As for leaving the system in BIOS overnight, I don't know what it would really prove, but I'll do it anyway just because I'm willing to try absolutely everything

Thanks for the help, everyone. It's GREATLY appreciated. This problem has been giving me headaches for quite a while

Waffleicious said:

I'll try running the event viewer next time I experience a restart. One didn't happen while I was at school today; just going to show that it occurs at random intervals

You don't need to wait for the next event in order to check the event viewer. If you can recall the date and approximate time of the last unwanted graceful shutdown, simply check the events just prior and just after that point.

Waffleicious said:

I don't think that the issue is malware because I have a decent anti-virus/spyware/malware program that scans emails and web pages and all that jazz (Avast!) and I also routinely scan with Spybot Search and Destroy. Spybot immunizes your browsers against malware as well.

Unfortunately, that is not an ironclad guarantee that the system is not poxed up with something. Jumping to conclusions is never a good idea, so let's just park that possibility aside for now :)