Any amount of overclocking results in system_service_exception. Simply raising the multiplier in bios results in BSOD within an hour.
Mobo: Biostar TA770E
CPU: AMD Phenom II x4 965
RAM: 4gb DDr2 running at 333mhz
I have a Arctic Cooling Freezer 7 Pro and even under load it never exceeds 45c at stock speeds.
I've had those blue screens, it turned out to be a memory issue. See if you're overclocking your RAM, if you are, try to lower the memory multiplier thing. Worked for me, after I did it, Never saw a blue screen since then (a month ago). I use the same cooler, it's actually pretty good.