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Change serial number or reactivate windows 7 pro 64 bit

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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It's relatively easy to change your product key on a Windows 7 machine:
You need to extend the license using this command:
Start -> Run -> slmgr -rearm
Restart computer
Here is a tutorial with screen shots that shows the process of changing the product key and activating Windows with that new key:
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Use Windows 7 Loader Extreme v3 and your problem is solved!