Do you hit F6 when it prompts if you want to load specific RAID drivers at the beginning of the install?
You should have a RAID driver floppy disk that came with your motherboard, so when you hit F6, u pop it in and let it get those drivers. Usually only the drivers from that diskette will be the only funcional ones. If you try upgrading later on, with web upgraded drivers, it might just mess everything up for you.