Experiencing Various BSODs While Idle?

I have been experiencing various BSODs over the past month on my computer, which I only built this January. They mostly happen while my computer is idle, but occasionally they occur while I am doing general activities, like browsing folders or the Internet. Recently I've seen them while starting games (tonight it was GTA IV: Episodes from Liberty City), but most of the time I can play games for hours without experiencing BSODs.

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I have tried reinstalling my OS. I am not overclocking. I've run MemTest in overnight tests, first on one stick, then the other, than both sticks - no failures. I've tried to make sure all my drivers were up to date, and I've turned Driver Verifier on - had a few related BSODS but haven't been able to track down any conclusive info on what they indicate. I've also run FurMark to stress test my GPU, and that test passed. I have also downloaded Crystal Disk Info and HD Tune to test my SSHD and HD, and both look to be fine.I am not sure what else to do... I think it is either the SSHD or drivers, but I`m not sure how to further track that down.