that is a very strange problem, i have never seen that before. i dont think it has anything to do with your harddrive, but you never know i guess. i would start with teh RAM. download memtest, burn it to a disk, then run it and make sure your RAM is ok.
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CPU || e8400
RAM || 2GB corsair xms2 pc6400 800mhz
HDD || 2x WD Raptor 150GB 2x WD 500GB
MBO || EVGA 680i SE
GPU || Evga 8800GT Superclocked w/ Accelero
PSU || Silverstone 750 watt
Case|| Antec p182
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