Basically My computer crashes whenever running some sort of application such as minecraft, or even Youtube, and it also crashes at random as well. I have a 64bit Windows 7 OS, Radeon HD6870 GPU, AMD Phenom II CPU x4 855, WD 1tb HDD, Corsair Vengeance 8gb RAM, an OCZ 850w PSU, and finally a disk drive. I have tested my HDD many times and i'm pretty sure its not infected in any way. I also recently returned my GPU for a new one which works a lot better than the last one (Which was broken) so im inclined to believe that that is also not the problem. I have updated all the drivers of all my devices, I have scanned my computer with Malwarebytes, Avast!, TDSSkiller, and even OTL and only found one Rootkit that i'm pretty sure i dealt with and it is gone. I am deeply confused and saddened by my computer's sickness and would greatly appreciate any kind of advice or help of any kind. Thanks Again!!!