Ok try and answer these questions.

I have kazaa lite yes, and i run adware and norton regularly so thats cool.

I defrag often. Not sure how to scandisk in xp.

All my drivers are up to date. Except for my gfx card ones cause the new ones cause problems. The hang is a complete hang or freeze up or whatever its called. ctrl+alt+del doesn't work, mouse is frozen, only think that works is to reset. I already have virtual machine.

As far as i am aware the cpu fan is fine. And i recently put in a new one and had this problem b4 with the previous fan.