Please help

I recently had a new computer built for me, all new parts except keeping my old hard drive (plus a new hard drive added as well.) This is pretty much what was put together: http://pcpartpicker.com/p/Hqzbf7

I'm running Windows 7, with a dual monitor display (the one in the link plus a Dell I already had). I regularly get the "blue screen of death" (a few times per day), but with different error messages each time. I've gotten "change input timing...", "IRQL_NOT_LESS_OR_EQUAL", "clock interrupt not received on secondary processor", etc. The machine also has experienced difficulty waking up from "sleep."

I've installed all the drivers that came with the parts (along with most of the software - ASRock OC tuner, etc -- do i need all that?), and checked for updates. I have Trend Micro anti-virus protection running and Sytem Mechanic Professional - neither has found any hardware conflicts. 

I can't pinpoint a specific time that these errors occur. I've gone a couple days with no trouble, then the next day have a problem every hour. Otherwise everything runs fine. 

Please, if anyone can give me any direction, keeping in mind my lack of expert technical knowledge...