I think both of us are assuming he's getting the "no drives detected, install disk/disk controller drivers" prompt.
It's not clear, but I'm pretty sure that's the only prompt you get for drivers during Windows setup.
Close, but not quite. Windows will ask for drivers anytime it identifies hardware that it doesn't have built-in drivers for. You see this sort of thing commonly when trying to reinstall windows on top of itself (especially with XP), during the setup process it will ask for drivers because it sees hardware it has none for on the CD, but the drivers are present on the system as they were installed after the original install.
SATA mode to AHCI in the BIOS
Windows Vista and newer resolved that little bit of problem, only 2k3/XP suffered from that particular flaw. Still, that doesn't exclude the problem with RAID mode, however Windows 7/8 don't need additional drivers to use it unless it is some sort of 3rd party RAID. Based on his specs the likely candidate would be the Intel Matrix RAID which Windows works fine with out of the box.
ascen, the best way for us to help you would be to take a picture of the message you are getting (phone or digital camera would do nicely) and post that in this thread. That should give us a clear idea of the prompt and single out the right solution for your problem. I've seen 3 possible answers in this thread but each resolves a slightly different problem.
i7-6700k @ 4.00GHz | Gigabyte Gaming-5 | GTX 980 4GB | 4x8 (32GB) DDR4-2400 Corsair Vengeance LPX | Windows 10 Pro x64 | 1x 1TB Samsung EVO SSD | 1x 3TB WD Green HDD