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How can I reinstall Windows 7 if I lost my installation DVD?

I installed Windows 7 from an original Ultimate DVD. I have the product-key but the CD has been lost. Is there any way to install it using my product key?

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marked as duplicate by nhinkle May 28 '11 at 19:17

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1 Answer 1

  1. Open cmd as adminstrator and enter the commands below
  2. slmgr.vbs -ipk {insert your new product key here}
  3. To activate windows after changing the key, run “slmgr.vbs -ato”
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