Random BSOD, error 0x7a

just got some random BSODs, here's the dumps

You gave us two crashdumps, but neither of them can be used to find a problem. In one of them, I did see your ATI drivers are older (Sept 28, 2011). You will want to update them, as it complained about a TDR failure. However, the screenshot you gave was an issue caused by a bad hard drive or hard drive controller. Your problem is most likely the drive with Windows on it.

If you wish, first run CHKDSK (both options selected). Then, run Seatools (all tests except Advanced).