Posted 14 November 2005 - 05:13 PM
What sort of computer are we talking about? Processor, ram, operating system etc?
Assuming it is not the computer, then some file sharing programs come with spyware.
If you do a control/alt/delete, select task manager and click on the processes tab it will show you all processes and programs running on your computer. Click the top of the mem usage column to sort by that and you can see what programs are using the most cpu cycles.