Windows 7 PC shuts down by itself

I have a 3 year old Windows 7 Pro PC that started ( about 5 days ago) shutting itself down.  The PC shuts down as if I initiated shut down.  All of a sudden it will say Windows is shutting down.  If I have a bunch of programs open when PC decides to shut down, Windows will not shut down due to running programs.  If I cancel the request to terminate the programs I have open, Windows does not shut down.  This problem seems to happen every 1 - 2 hours.

Things I have done or can verify:

1)  Inside of computer has been cleaned
2)  Applied new thermal paste to processor
3)  All fans are spinning
4)  No malware on computer
5)  Windows 7 Pro is activated.  OEM license from HP
6)  Tested power supply with Ultra Power Supply Tester - no issues detected
7)  Currently running memtest -  3 passes, no errors
8)  No bulging/leaking capacitors on mobo
9)  Computer is offsite at a new location.  So it's not the surge protector
10) Event ID 6008 and 1073 are logged around time of shutdown or attempted shutdown.
11) Power setting is set for high performance - no sleep
12) Ran SFC /scannow  - no issues found
13) Verified hardware drivers are up to date
14)  Ran speedfan.  Temperatures are in range and normal


Computer Specs:

Hewlett-Packard HP Pro 3130 Microtower PC
Microsoft Windows 7 Professional Service Pack 1 64bit
Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz (2.90GHz, 1024KB Level 2 cache)
4,096 MB RAM
SAMSUNG HD502HJ 465.76GB IDE
ATI Radeon HD 4550



I am at a loss and don't know how to proceed.  Has anyone seen these symptoms?

Thanks
itechresultsAsked:
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itechresultsAuthor Commented:
Thanks all for your suggestions.  I replaced power supply and in Windows power options changed "Choose what the power buttons do" to nothing.  By default it is set to shut down.

I haven't had the shutdown problem for 24 hours...a step in the right direction.
I also ran Prime95 TT for 4 hours with no shutdown.  I'm hoping issue is licked.
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helpfinderIT ConsultantCommented:
try another AV scan - maybe when win is not booted up - e.g. bootable USB of Kaspersky Recovery Disk 10
check your scheduled tasks if there is nothing scheduled
do this happens also if you log as different user on that machine? (try to create test account and work for couple of hours)
is something suspicious in msconfig>Startup items?
what exactly events are saying (can you copy/paste here)? And appears these events only in time when these shut downs appears or also in other  times?
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itechresultsAuthor Commented:
Ok, I'll try suggestions \ post info once  memtest has completes 6 passes.  Thanks
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jcimarronCommented:
itechresults--
Run a System Restore to a date before this started.

Look in Event Viewer and see what the General tab of the Error timestamped when this happens says.  Copy (right panel) and post here.  Is a Faulting Module named?

Start|type reli and click "View Reliability History".  Click on any red Critical error dots.  What info can you get from the Action column?
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nobusCommented:
install speedfan to monitor the temps http://www.almico.com/speedfan.php      

try this hotfix :  http://support.microsoft.com/kb/2627489

post results
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McKnifeCommented:
Windows 7 shuts down after 1 hour when it is not activated and the grace period for activation is over. Maybe for some reason your activation status changed? Check that, please.
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itechresultsAuthor Commented:
Solved problem myself
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jcimarronCommented:
itechresults--Thanks for telling us the fix.
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