I have a 500 P.S.U.--- and a nVIDIA,nFORCE 750 motherboard===,with a chipset video card ,, and every time i try to play on my game , Flight Simulator ,Or run Google earth my computer blue screens ,..this happened before and under warranty the tech put in a new Hard drivetrhat is i terabyte Will his computer system work better if i install a real video card? And what is a good middle of the road card ??