is the performance suffering? noticably sluggish behavior?
reasons could be:
1. a program/application isnt working properly, caught in a snarl. ctrl+alt+del and start terminating things till its running fast again
2. virus checker active?
3. cpu cooler program active (they block unused cpu cycles so it looks as if its running at 100%)
4. trojan virus or some other nasty memory resident
95% of the time its just a program missbehaving
my cpu indicator is always at 100% anyways. its called the cure for cancer project
"i love the smell of Overclocking in the morning!" Says my Hamster.