Product Key is saying it is not valid - when it is genuine.(Windows Vista)

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  I have been having continued problems with my laptop and the latest is the when it was updating Windows something went wrong and when I try to re-enter my Product Key it is saying not valid when I it is a genuine product key. I have tried following instructions on this site but I dont have the icon CMD.EXE.

  Please can someone advise me, as I have already spent hundreds of pounds last year on other problems with my laptop.

  Thank you in advance.

  Monday, February 21, 2011 10:47 PM