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my licensed windows 7 professional (64bit) became evaluation copy after service pack 1 RC installation and will expire. is there a way to fix this besides re-installation of the OS?

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Are you sure it was not SP1 RC? – Moab Feb 23 '11 at 17:23
yes it was SP1 RC – sterz Feb 23 '11 at 19:10
up vote 2 down vote accepted

You should be able to attempt to activate your "evaluation" copy. When you do, it sounds like the activation will fail. At this point it should give you a phone number you can use to contact Microsoft, and their support should be able to fix this for you.

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+1. Just try to reactivate. Even if you have to call up, I'm sure they won't give you much hassle. – Shinrai Feb 23 '11 at 18:20
i removed SP1 RC completely. had some issues with ie8. – sterz Feb 23 '11 at 19:11

You could try re-entering your valid install key:

  1. Right Click on My Computer and Select Properties.
  2. Wait for activation details to get populated.
  3. Click on Change Product key link (after activation details are populated).
  4. Enter your Product Key and click on next to activate.
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