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.


Just run Anytime Upgrade, and when you're prompted for a license key, enter your retail key. It should work just as well.


You can also probably just run the upgrade from the DVD. Make sure you run it from inside the existing system, or else it will install a clean installation (making a Windows.old, but still).

  • 1
    This is actually incorrect. I have tried running an upgrade from Windows 7 Home Premium to Windows 7 Professional from the installation disk before, and the installer told me to restart and use anytime upgrade. – nhinkle Mar 14 '11 at 3:55

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