After wrangling for hours here is what worked for me and many other people. Vista does not include the nessessary drivers to do a clean install from the DVD. You can do a clean install, just you have to do it from an exsisting OS.

Guide for a successful install of Vista Beta2 onto an nForce4 SataRaid system

Preparations:
As Vista Beta2 does not contain the necessary nForce SataRaid drivers, users with an nForce Raid array have to download not only Vista, but also the latest nForce drivers.
a) SataRaid drivers for Vista x86:
You will find them here. Download the 32-bit driver package named nforce_vista32beta2_english.zip, unzip it and copy the content of the IDE\driver\LEGACY folder onto an empty floppy disk or thumbdrive. I used my thumbdrive.
b) SataRaid drivers for Vista x64:
You will find them here. Download the 64-bit driver package named nforce_vista64beta2_english.zip, unzip it and copy the content of the IDE\driver\LEGACY folder onto an empty floppy disk or thumbdrive. I used my thumbdrive. You may find these drivers in another folder but they are there.

Read on, in the forums!

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