Not sure if this observation fits your remarks here, but please note
that if, for some reason, a machine presently has Vista Home, you
can't upgrade to 7 Enterprise. Upgrade has to match existing edition.
Quoting Geoffrey Duke <[log in to unmask]>:
> * A system must have some version of Windows purchased with it. Our Campus
> Agreement covers upgrades to existing Windows OS. Buying a system with Linux
> disqualifies that system, and you need to buy a Full (i.e., non-upgrade)
> Windows license for the computer, preferably through the Microsoft Select
> program via the Computer Depot.