unattended installation over the network?

Hi folks!

I've created an unattended script using the Windows SIM tool. I'd like to
use it to perform an unattended installation of Vista over the network. Much
like I do with Win2k/XP - boot with a network client and kickoff
installation by passing the unattended script to the setup routine. I've
tried booting with Windows PE, mapping to a share with the Vista DVD
content, but I can't run the setup.exe file from Windows PE. It seems like
setup.exe only works when launching from a full version of Windows. Surely
there is a way to accomplish what I want and I've overlooked it!?

Thanks!

-Fred.