CPU intermittently pegs at 100% for 30-60 minutes.

First of all, I would like to say that I am more tech-savvy, but after 4 months trying to resolve the issue on my own I gave.

My problem is that 2 - 3 times a day, for between 30 to 60 minutes, the processor in my machine just ramps up to 100% (see: http://imgur.com/MwCyq) and will sit with all 4 cores clocked at 100% for the better part of an hour before returning to normal. This occurs even when the machine is idling without running programs and he returns quickly if the machine is restarted during one of these "unique". I have scanned for viruses (including safe mode), hundreds of times using updated versions of Symantec, Malwarebytes Anti-Malware and Spybot S & D without success that leads me to the idea that it is a discount Virus. Furthermore, I have flashed to the latest BIOS version and I also determined by the test pilot is not a problem with the GPU. I did a clean install of Windows 2 weeks that has not solved the problem and hardware diagnostics indicate any physical problems with the machine.
My system specs are as follows:
HP Elitebook 8540w
Win 7 Professional
i5 M520 @ 2.4 GHz
BIOS - current
RAM - 4 GB
NVIDIA 880M
I worked with one of my friends who are professional IT on it and everything we tried (described above) has failed. This question has been persistent since just after Christmas 2010 and my immense patience begins to wear a thin. I searched everywhere on the net for an answer to this problem which seems to have a lot of people, but there is no consensus on what the cause of it is and all the solutions that other issues have not worked for me. So I appeal to the vast knowledge of the community of Windows answers to see if they can shed some light on the question.
Thank you.

Do a "clean boot" - how to solve a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.Microsoft.com/kb/929135
(The steps # 1 a, 1 b, 1 c, 1 d and 1e)

Perform a clean boot to determine if background programs interfere with your game or program
http://support.Microsoft.com/kb/331796

J W Stuart: http://www.pagestart.com

Tags: Windows

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