Halo On Windows Vista » Halo 2 Vista » General Discussion » Re: can i unregister my product key? Re: can i unregister my product key?  09-02-2009, 11:18 PM Knight Joined on 05-16-2007 Louisiana Posts 504 Re: can i unregister my product key? Reply Quote No there isn't. You will have to contact Microsoft and ask them about it. Report abuse View Complete Thread

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