the first one was the way to go, you will need the RAID drivers of your motherboard, you can download them from the mobo's website.
After that, you can use the program "RT Seven Lite" to add those RAID drivers to your Windows installation CD (this guide should be easy to follow: http://www.sevenforums.com/tutorials/145343-slipstream-windows-7-sp1-into-installation-dvd-iso-file.html)