Hi, One of my friend has a Compaq Presario 5340. Has about 340 something MB, recently installed 160 GB harddrive from 7 gb HD. 400 MHZ. After he installed Win Xp, He said that his CPU usage went up 100% and he ran updated Spybot and Adaware and found a few but didnt help any with CPU usage. Tried everything I know how to help him with it but so far no luck. Wonder if it has to do with chipset not compatabile with Win Xp or even motherboard not compatiable for Win XP? Could it be drivers that needs to be updated? I dont see any that needs to be updated from Device manager? Any help would be appreciated... Thanks!