How to use a retail Windows 7 Professional license key to upgrade an installed Windows 7 Home Premium machine

Posted by jalperin on Super User See other posts from Super User or by jalperin
Published on 2011-03-13T23:50:39Z Indexed on 2011/03/14 0:12 UTC
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I purchased a retail version of Windows 7 Professional and installed it on a computer. That machine has died, and I replaced it with a new computer which came with Windows 7 Home Premium already installed.

I'd like to have Professional, not Home Premium, on the new machine, and I don't want to pay for an "Anytime Upgrade" because I already have a valid Windows 7 Professional license (for the dead computer).

Is there a way to legally upgrade using my Professional license key? I've already installed programs, data, etc on the new machine, so I don't want to reformat and start from scratch.

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