I have a 1.4ghz athlon w/ ECS K7S5A. 40gb WD. SBL! MP3 5.1. 512 mb ram ddr crucial, geforce 2 gts, Future power 400 watt. I think this is a mobo issue. It's not a virus issue because I have format and install the os twice and it still does that. It's not software because I just install a new os so the hdd is pretty new. Yea, it happen when i'm online. My processor is idle around 42 and max is 48.