I was surfing the net earlier and downloading a torrent when my screen suddenly spazzed and sort of went black before my computer rebooted suddenly. After it started loading it went through searching to see if there were any errors and it said something about Firefox and Azureus (the torrent program I was using) and that their were errors or something and it had been truncated.
Once the scan reached 100% my computer loaded normally and then once everything was booted up an error message popped up saying it had
recovered from a major system error. Does anyone have a clue as to what might have caused this? I haven't had any real problems proceeding this so it was out of the blue. Does it mean my harddrive is failing? The computer isn't that old.

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It has also been a little slow lately but none of my virus/spyware scans has found anything abnormal so far.
-Far