There are probably a few different ways to disable/enable them via BIOS -- enable the SATA controller, enable RAID on the MB, enable RAID for the drive. Once you have that working, you should be able to see RAID options during booting; you can go ahead and configure the drives in this. You'll then need to install the NVidia drivers if you haven't already done so in Windows to get the RAID array recognized (as a drive). Then you'll need to initialize / partition / format the array in Windows Disk Management to use it as a drive.