@karbo: Agreed about all except the psu. This might be the psu somehow, but then why didn't it fail during the 23-hour long stress test? I did not suggest prime95 as a tool to test memory, but it's good to know it can do that. However I can not say memtest can be signed out based on what I know, esp. considering that according to JHughes' quote, you need to configure Prime95 in a particular way for it to verify data integrity.
IMO, the following things are still potential causes, in the order of likelyhood:
1) HDD problems
2) OS corruption problems, incl. AV software corruption and a bad Windows update.
3) RAM problems
4) Graphic card problems
5) PSU problems
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