Is the computer overclocked? If so drop the overclock and see if it runs fine.
Beyond that, you really need to get to your logs on /var and work out what is causing it to die. My best guess would have been the overclock, beyond that i'd be looking at voltages and temperatures, then bad hardware (remove all pci(-e) cards and put them back in one at a time with a reboot in between, memtest86.
But please give us a little more information. We need to know the hardware spec of your computer, the contents of dmesg may also help (in [ code ] tags please).
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