A friend of mine has been having issues on Win7, BSODs at random times. I told him to run memtest86 to rule out memory issues and it turns out that he has around 33 errors (he ran it for 11 hours):
Yeah he needs to buy some new RAM or send his current RAM back if it's new and ask for a replacement. I've bought defective RAM before (oddly enough G.Skill RAM for me too), sometimes it just happens.