Just installed windows 7 on an older system I built: X2 3800 on an epox 9NPA+ ultra (socket 939). It was running fine for the first day or so (didn't install any hardware drivers for the motherboard, graphics card, or anything since everything seemed to work) but now the computer randomly shuts off. Is this a hardware problem? I thought perhaps some of my hardware might be too old to work with 7....?