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product key not working

my window 7 professional product key is not working when i press 0 it say unacceptable character i couldnt enter my product key
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  1. just a shot in the dark,try another keyboard?
  2. Best answer
    I'm fairly sure that neither 0 (number) nor O (letter) are valid characters in MS keys. Of the half-dozen I could easily look at, none of them had a single zero.

    Are you sure it's not a Q or D?
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