Thankyou, I haven't had much luck yet getting an XP SATA driver. I did manage to install XP Pro by changing the BIOS setting for the HDD from "optimized" to "compatible". I got XP working, but I was uhappy with the way it was working; namely the video driver and a heap of other not 100% critical components like the fingerprint reader...
I'm starting again reinstall of Vista and 2 partitions...
I might have to accept defeat and just work with Vista...

Cheers
Kieran