Sounds very much like the sort of error you would get with bad RAM. So your first step should probably be to get a copy of memtest86+ and let it run for a few hours. If you get any errors, then you want to start testing each memory module individually to figure out which one is bad. If you have more than one, it might be worth the time to test the individual slots for RAM on the motherboard to see if that is what is bad.
Thanks cl-scott! I tested one stick of RAM at a time and it turns out there was one faulty stick out of the four installed, so I'm now running at 12GB instead of 16 (no big deal). The faulty stick is one of four 4GB Corsair Vengeance sticks I bought. It there a way it repair the stick or send it it for repairs/refund?
Again, thanks a ton!