Windows Vista Setup fails

Hi
After trying for three days, I finally managed to download build 5384 Beta 2
64-bit edition of windows Vista. The ISO checked out and burned successfully
to DVD, but when booting it stops after the "Install Now" page and reports
"Cannot find information about your hard disks" and returns to the "Install
Now" page.

I am using
amd64 2800+ socket 754
1Gig RAM
GeForce 6600GT 128mb AGP
2x80Gb SATA (RAID 0)
1x120GB IDE
Gigabyte GA-K8NS Motherboard with latest BIOS patch (F19)
Nforce 3 250 chipset

I have tried disabling the RAID - which is ok as I am going to install on a
55Gb partition on the IDE drive and even disabling the SATA controller, all
to no effect.

Any help would be appreciated