BSOD's During WoW

My son is getting BSOD's while playing WoW on a freshly built Windows 7 - 64 box. This is odd as it seems to handle more demanding games like Crysis and Dragon Age just fine. Crash can be anywhere from 10 minutes into playing or an hour.

Do you know what the general BSOD error is? eg. IRQL EQUAL OR LESS

I had a freshly built system that was doing that exact same thing, but usally within 5 min a opening wow. I had to update the video driver to a NON microsoft supplied driver and for some odd reason had to underclock my video card by 50 mhz. I found that fix on a WoW forum months back

I have never used a MS Video Driver (just replaced nVidia latest release version w/ latest beta).

Never seen the BSOD error because I have trouble being in same room when my son is playing WoW :)