I am using Microsofts imaging (Imagex.exe) tools to set up Windows 7 Machines. I have switched between Enterprise and Professional versions of Windows 7. It turns out the imaging tools don’t like that.
If you get error “the product key entered does not match any of the Windows images available for installation” Go to the ei.cfg file in installation files and change the version from Enterprise to Professional or other way around.
Techno babble from an IT guy named Harry 
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