Vista Installation Woes

I purchased the Vista Home Premium Upgrade Download from Windows Marketplace,
and I have been problems with the upgrade. This is an issue that many have
had, but on the first restart during installation it comes to the black
screen with the rolling green bar and copyright microsoft text on the bottom
and it freezes there. I've tried updating all of my drivers before
installing, installing without entering the activation key, disconnecting all
peripherals, and uninstalling Norton 360, all to no avail. The two things on
the upgrade advisor that I have done nothing about are my sound card (Audigy
2ZS) and the SATA/RAID controller. The sound card drivers for vista won't
install until I actually upgrade to vista and I can't find updated SATA/RAID
controllers. I did order the DVD this morning in hopes of doing a clean
install, because I don't think its possible to do that with the downloaded
version. Any help? Thanks