I think the problem with striker II is serial ata controller, as usual with nvidia chipsets. Also, the memory unstability is another factor to take note.

I received my new striker II after rmaing the first I had, I didnt touch the original bios (0402), installed vista x64 with 1 module with 2 GB (part of 4gbhz gskill), installed sp1, then nvidia drivers except mediashield, copied the entire timings detected for one memory module, put the second module to b1 and used those timings for both, enabled calibration and ddr3ref with 1.9v for a1 b1, and have now a stable system.

Ive passed 20 sfc /scannow and all is ok