Hello Eric, thanks for contacting us through the Intel Communities.
Regarding your situation I would like to inform you that Windows 8.1 comes with preloaded F6 drivers, therefore it is not necessary to install any. You just need to run the RST executable file
The driver version of the software that you need to install on this board is 12.9. So please try installing the following Download Center
If you continue having issues, I suggest you to delete the RAID and install the operating system in only one hard driver (no RAID set up).
The hard drives needs to be on RAID ready. Once you are able to install Windows 8.1 in the hard driver, you can create the RAID array on Windows.