hate to ask for free tech support but my Windows 7 computer has recently started freezing for several seconds at a time but never crashes it works quickly when it does work but then hangs' starts working' and hangs again I don't think it is a virus or software issue because virus scan turned up nothing and same problem occurs when in safe mode. i think its a hardware issue but what could cause this? should I just chalk it up to the motherboard and junk it?