2
votes
1answer
2k views

Downgrade from Windows 7 Ultimate to Home Premium?

A few months ago, I acquired a Windows 7 Ultimate product key and updated from Home Premium to Ultimate. Well, now I get the "This copy of Windows is not genuine" message. I have the Home Premium ...
1
vote
1answer
191 views

reinstall and XP downgrade rights

I have to reinstall a system that originally (at time of purchase) exercised the XP downgrade right. But the COA sticker only has a product key for Vista Business. What key should I use to ...