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It appears to be a memory fault of some type. You didn't provide us with much information about your system, it would have been helpful. Knowing OS, PC type, RAM amount, any other problems or changes to your computer (software or hardware), and when the problem began... (Just because you have computer specs in your sig doesn't tell me that it is the machine we are dealing with. I don't assume.)
* It seems to be a memory problem. The easiest and cheapest fix would be to start with re-seating your RAM. Turn off the computer, unplug it, press the power button for several seconds to dissipate any "held charge", touch bare metal section of computer case to dissipate static charge (do this regularly while working on computer).
Once the computer is open, pull the RAM sticks out, check for damage/debris/anything unusual on the RAM mating surfaces and any other obvious damage, if all is ok then put the RAM back in securely. Check to see if problem continues.
* If problem continues: try Memtest to check for faulty RAM (yes its free). Download it here:
http://www.memtest86.com/ Full instructional and product description is available on the Memtest86 site. Check to see if problem continues.
* If problem continues: If you have more RAM for this computer try installing it and see if the problem continues.
Post back with the results.