1. The motherboard BIOS is out of date.
2. The SATA cable was questionable.
3. The RAM was mixed (passed all memory tests but yet...)
4. The OS was infected. (Use Grif's help at http://www.cnet.com/forums/discussions/how-to-remove-pup-option-603542/#post-f742c795-5881-433b-a29b-6d758efe5cd3 )
5. There is a problem with the content on the drives.
a. Run chdksk /f on all drives.
b. There are video files on the drives and a codec is blowing up (see event viewer for more clues)
6. Try starting with a BLANK second drive. Do not put any files on there. Does it blow up?