Activate window 7 in my Laptop

i installed window 7 OS. but it showes that this product key already used. how to activate my window 7.
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More about activate window laptop
  1. I believe you can call up by phone and confirm your ownership of the operating system.
  2. Best answer
    Buy a legit copy. If you thought you bought a legit one and it isnt, contact Microsoft, explain to them what is going on and they will happily take your money for a valid key.
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