How do I re-activate Windows 7 after Windows has decided it is no longer genuine after an update?

Posted by Joe Corkery on Super User See other posts from Super User or by Joe Corkery
Published on 2012-01-28T01:33:08Z Indexed on 2013/10/18 10:02 UTC
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windows-7

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activation

Windows just recently decided that it was no longer genuine and it keeps telling me that I need to re-activate. However, the dialog that pops up asking me if I want to make it genuine seems to crash or give a fatal error: 0xD000006. I've looked in Properties page for My Computer in the Windows Activation section and it simply says:

Status Not Available
Product ID Not Available

And there is no option to activate. I'd prefer to not have to reinstall Windows 7, so any leads would be greatly appreciated.

I've tried re-activating using slui.exe as suggested in the answers below, but when I do that I get the following error dialog.

enter image description here

I'm not quite sure what to do now and the thought of being on hold with Microsoft is not terribly appealing to me. Thanks.

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