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#41
The only problems I had with installing Win7 were fixed by just clearing the cmos and resetting everything back in bios. It's worth a try because it worked for me on two different machines.
Looking at your system specs with the Q6600 and 4GB Ram you might try bumping up the NB voltage in bios just a tad. It's been known to stabilize Win7 with 4GB Ram. Proof of concept in link below. Has also worked many times, this is only the most recent.
Windows 7 crashes
I realize these are both long shots but were running out of options here man LOL.