I did a change from IDE to AHCI on my Asus P5K PremiumWiFi-AP Intel P35
(Socket 775) PCI-Express DDR2 a few months ago. Win XP sp3
I had fitted an external e-sata plate
http://www.amazon.co.uk/StarTech-co...2?ie=UTF8&s=electronics&qid=1270416078&sr=8-2
to make use of the e-sata connection on my removable hard drive enclosure.
I forget how I did it, but came up with the solution quite quickly by a
doing a google search.
best of luck Peter