You can do a clean install using an Upgrade disc. The link I have supplied tells how. Basically, the install disc offers "Upgrade" or "Custom Install" choices... you select "Custom" but, you tell it NOT to Activate Automatically Online once installed. Then, as the instructions, say in the link, you run the disc, again, from w/in Windows (this time), select "Upgrade" (this time) & then, Activate when the upgrade (wink, wink) is done.
Note: Even Upgrade discs have the 2 choices.
You can do this using whatever flavour of 7 you want...since, it's a clean install, anyway.
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Cheers,
Drew