Like Moonie said, click on the "CPU" column in task manager. It will give you a continual update of what process is using the most CPU at any moment. Watch it for a while and see if you can spot a particular process or two that regularly pops to the top of the list (other than the "System Idle Process" which goes to the top when nothing is using the processor).
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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