My vista businee product key does not work

Hello,
my system crashed so I had to reload Vista Business O.S. but when I try to use my product key it says it is already registerd so can't do
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  1. Joelfulilwa said:
    Hello,
    my system crashed so I had to reload Vista Business O.S. but when I try to use my product key it says it is already registerd so can't do
  2. Use the phone registration method.
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