Hello Zero,
Is this the error you are seeing, "A clock interrupt was not received on a secondary processor within the allocated time interval"? It usually appears to be processor related from what I am seeing.
You should make sure your processor is stable. Download the appropriate copy of prime95 for your computer from here:
http://www.mersenne.org/freesoft/. Start by running a small FTT test for a couple hours. If it locks up the computer or crashes it, repeat the test a few times to see if you can reproduce the crash consistently. If it does not produce these results, start a blend test to see if it achieves the same. Please note these tests will heat up your processor considerably, so you should have good cooling and watch the temps while they work. Post back on your results.
Also, include your system configuration as well (OS, Processor mfg & model, board mfg & model, and memory configuration).
Cheers