Window,
Ive just logged onto this forum to post an identical issue.
I have 2 drives (Crucial M4s) in a raid 0, one of which is reading 'Error occurred' but is generally fine.
One or twice an evening I the PC locks up for 30 seconds then carries on what its doing.
I cant find any diagnostic tools or anything to run SMART tests.
Ive installed HD Tune and ran an error scan, everything looks good.
Both drives have been on the latest firmware and less then 3500 hours.
Reference your update problem, have you tried the bootable CD?