I didn't get the responses notices to this thead. Just... noticed. Thanks!
My BSODs are of the "memory parity error" type. For almost a year and a half, I've tried to get rid of the problem trying several strategies (memtest, prime95, etc.), to diagnose the problem but none worked. Lately, I thought that it was linked to the way my RAM modules are inserted. but 1.5 month later... it came back. Less often though, but it's unpredictable.
I see no connections between the contexts in which the BSOD's happen. I suspect it's a hardware defect, but Dell never wanted to take my laptop back -- just because they couldn't diagnose the problem properly on the phone! (The last thing they wanted me to try was to reinstall windows and all my software and wait for the problem to happen again. This is when I said : Sorry guys, this is like 40h of work for me — maybe for nothing — and I can't afford that now.)
I've had really nasty crap happening because of ATI drivers.
At some point I suspected it was ATI related (well, at some point, I was even wondering if it could have been related to my blood sugar). But how can I ever find out, since the problem is intermittent???
Anyhow, getting back to the mbr problem : so the possible answers would be : a dying block or a bad driver corrupting HardDrive data (mbr in that case)?