Sounds like a heat problem or loose connection... Try this...

Remove the memory modules, and reseat them 3 or 4 times, gently rocking them back 
and forth in their slots while doing so.

Then, check the CPU heatsink and fan.  Make sure the fan is spinning as it should, 
and clean it of all dust.  If it appears in good working shape, try and remove the 
CPU heatsink and remove all the old thermal compound from both the heatsink and CPU, 
and reapply some high quality thermal compound, then reseat the heatsink and make 
sure it is securely attached to the CPU.

I recommend going to microsoft.com and searching for the windows memory diagnostics 
software.  Its a free memory test utility that is excellent for testing hardware. 
 Create a boot disk on another PC with the memory diagnostics software, and use this 
to boot your problematic PC.  Run the memory test while tapping (gently) on memory 
modules, and the motherboard, etc...  If anything is loose or bad, the system will 
freeze or give memory errors.. If it is a heat problem the system will probably freeze 
or power off shortly after starting the memory tests.  If the system runs stable 
for a good hour or so with the memory test, then it is probably safe to say that 
you do have some kind of strange software glitch.  But, again, this sounds like a 
hardware issue.  The memory test will also help you to test the system while preventing 
you from damaging the windows installation any more from the continued inproper boots/shutdowns.

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