New
#21
OK, if *all* your games are hanging, then it sounds like your video card is overpowering your CPU - nVidia drivers (the non WDDM anyway) will put the cad in a low power draw mode since 1.75.xx and when you run your game all of a sudden it tries to jump up in power by readjusting all the clocks back to rated speeds - which is a major power draw.
I'd check another card and/or check that card in another OS again....
If it is not related to the card in anyway, Then I'd suggest a fresh install of W7....