I recently installed a new HDD due to my previous one dying. Installed win7 etc without a hitch. My problem is when I try to play any video game that isn't Hearthstone or WoW. Take chivalry :medieval warfare for example. I join a server and then something crashes outside of the game causing my Pc to hang for several minutes. If I am patient enough, I can bring up the task manager and close chivalry which free's up my pc once more. Most of the time I hard re-set. This also happens with TF2. These are the only games I've tried to far. I can guarantee it's not my CPU or my GPU overheating as the temps in my machine average around 40C for both CPU and GPU.