Check your memory with Memtest86
Make sure your memory-voltage (Vdimm) is set to 2.6-2.7V in BIOS, also make sure your timings are set to 'by SPD' - alternatively, you might want to manually set some more relaxed timings like 3-3-3-8 for example.
The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.
AMD Athlon 64 X2 6000+ 89W :: Asus M2N32SLI Deluxe :: 2x1024MB Muskin XP2-6400 DDR2-800 :: BeQuiet! Darkpower Pro 530W :: 2x WD Raptor 74GB/10k rpm, RAID 0 :: ATI Radeon X1950XTX