1. Upgrade the Windows Vista Home Basic or Home Premium to Windows 7 Home Premium without using any product key. (If you are a user with a non-HP or non-HB windows 7 DVD media, you can copy the ...

I'd say reinstall both Windows copies anew, I.E., Win 7 Home Premium to the laptop, and Win 7 Ultimate to the new PC. You will spend more time goofing around with the downgrading, and the results ...

That’s why you can’t use, say, a Windows 7 Home Premium product key to install Windows 7 Professional, even if you have a disc for the latter.