To solve that problem, I found I had to use the ASUS provided Driver CD that came with my P8P67 Deluxe. The problem occurs when on initial OS install you try to use the latest drivers on the ASUS site for everything, and avoid what's on the CD. The problem is, you can't. ASUS so far has not provided an updated driver for that device. I went through the exact same thing, trying to install the latest drivers for everything. And it worked, all except for that device.
So get out the CD, run the autoplay and choose intall Intel Rapid Storage Technology from the menu. Fixed. After that I chose to disable/uninstall it...