I wrote a script to do this, it's primary purpose was to "pre-activate" a Windows 7 install DVD but it grew to also install drivers, updates, setup background customization and a few more things. Is this not the preactivation kit from MDL. yes this is the preactivation kit I posted on MDL there is no way to get around updating each and every edition in install.wim but with the scripts you can do something else for the hour it will take to get the job done.