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Change serial number or reactivate windows 7 pro 64 bit

Hocke_sweden
Hocke_sweden used Ask the Experts™
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I reinstalled a computer with a image with windows 7 activated already, now I have 2 computers with the same windows  7 serial number. I need now to change serial number or reactivate windows 7 pro 64 bit on 1 machine, how do I do that?

I don't want to reinstall it


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Top Expert 2012

Commented:
It's relatively easy to change your product key on a Windows 7 machine:

http://windows.microsoft.com/en-US/windows/help/genuine/product-key
You need to extend the license using this command:
Start -> Run -> slmgr -rearm
Restart computer
Top Expert 2012

Commented:
Here is a tutorial with screen shots that shows the process of changing the product key and activating Windows with that new key:

http://www.sevenforums.com/tutorials/18630-product-key-number-change.html

Commented:
Use Windows 7 Loader Extreme v3 and your problem is solved!