Computer boots up and shuts back down

HP Desktop Model-p6240f
When I start my computer up it boots up through to the home screen for a few minutes and then shuts off.  I have Norton Anti-virus on this computer.  I have also disconnected all peripherals on the computer.  I did notice lately that both fans continue to run at a high speed and don't shut off very often.
HELP please!   Thanks

Have a look at the following "HP Pavilion p6240f Desktop PC Troubleshooting" sites to see if it helps:
Fan is Noisy and Spins Constantly (Windows 7): http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01857696&tmp_task=solveCategory&cc=us&dlc=&lc=e...
Windows Error Recovery: Windows 7 failed to start. A recent hardware or software change might be the cause: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01896806&tmp_task=solveCategory&cc=us&dlc=&lc=e...
How to Determine if the CMOS Battery Has Failed: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph03560&tmp_task=solveCategory&cc=us&dlc=&lc=en...
I am an HP employee but not speaking on behalf of HP
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