Odd crash

[Robert]

I was defragmenting my E: (two 320gb drives in raid) when my mouse went jerky. Then it seemed to hardlock? It didn't do it on my C:. I've rebooted and starting defragging again and my mouse point is jerky again?

E6300 @ 2.45 (350*7) - 1.375v
2*512geil/dual channel/2v (just passed two passes of memtest)
Audigy 2
Gigabyte DS3
X1800XT

I was also browsing at the time, not sure if that caused the problem.

Edit: This time it defragged ok? All voltages are apparently OK.

[Clunk]

check for viruses and spyware, could be something as simple as that. Could also be the hard drive overheating.

[Robert]

I'd say it was something you listed - rather than system stability as so far windows hasn't crashed without a good reason e.g. when I was messing with oc's coming in and out of games.