Reading Windows Performance Tab High CPU Usage (30-80%) On Idle Laptop?

High CPU Usage (30-80%) on Idle laptop? - reading windows performance tab

I had a problem with my laptop for a week now.

When using idling, with nothing but the desktop and open the important programs, my laptop 30-80% of my processing power of the processor, but it shows the System Idle process is used that only 5 to 15%. I formatted the hard drive three times in the past week with the hope he had a problem with my installation, but if my computer is fully updated, the problem again. Is there a new virus in the latest update of Windows XP hidden? Or is it a possibility they can be resolved so that you have a degree of peace? I hope someone else has had this problem, so I know that I am not alone with him.

System Specifications
Windows XP Service Pack 2
2 GB of RAM
Laptop is ademately one and a half years, Dell Vostro 1400th

If someone needs further information, please let me know and I'll publish it.

The following two links are pictures of the Task Manager, what is the question:
*** *** Performance Tab
http://i198.photobucket.com/albums/aa142/loki61089/Misc/TaskManagerProblem-Performance.png
PROCESS TAB *** ***
http://i198.photobucket.com/albums/aa142/loki61089/Misc/TaskManagerProblem-Processes.png