RAM must be dying. Download and run Memtest86. I'd get the .iso version and copy it to a CD... Best way. Boot from it, and complete a scan.
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Core 2 Duo E2140 1.6GHz @ 3.04GHz
GA-P31-DS3L
pqi Turbo CL4 DDR2-800 2GB
Sapphire HD3850 256MB
Sony Writemaster DVD Burner EIDE
Seagate Barracuda 80GB 7200.9 8MB SATII
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