A Memory Dump.
You should check your RAM with SANDRA or MEMTEST86 memory benchmarks.
They could be damaged.
Tell us the results when you've finished the test.
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ASUS P4P800-E Deluxe, Intel 3,0Ghz HT 800Mhz 512kb L2 Cache, ASUS Radeon 9600XT TVD, 2x512mb Kingston ValueRam DDR400, PSU SafeForce 420W, Maxtor DiamondMax 9 200GB IDE, Maxtor DiamondMax 9 160GB SATA, Western Digital 80GB IDE, Seagate 40GB IDE, ASUS DVD-ROM, LG 2166 Lightscribe DVD-Writer.