Lewy:
All raid arrays have to be setup prior to installing the operating
system. I'm using a NForce4 chipset; 1) I enabled raid in the bios, 2)
During post I hit F10 to setup the raid array, 3) Booted to the Vista DVD,
4) Installed Vista. With RC1 there were problems with the NVidia raid
drivers, those were corrected in RC2 and RTM. The NForce4 raid drivers are
included on the Vista RTM DVD, I'm not sure about the NForce590 raid
drivers. During installation when the screen comes up as to where to install
the operating system, If your raid array is listed the drivers are included
on the DVD. If the raid array isn't shown you will need to install the
drivers by hitting "Load Drivers". The easy thing to miss is enabling raid
in the bios and setting up the desired raid array during post, before
installing the operating system. Have a great day.