Selling my Windows 7 as used to someone, however, I have lost track of whether the product key is still used on an old PC of mine.

Is there any quick way to check whether a product key has been used or not? (Without going through the install and activation process).

N.B: It's all a legitimate purchase from Microsoft!

EDIT: I have found a piece of software which checks if the product key is valid, but not sure if the information displayed shows if the product key is already activated (refer to screenshot section on the link)... The link to the software I found is at

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2 Answers

  • Go to Control Panel
  • Click System and Security
  • Click System
  • In the bottom-right corner click Change Product Key
  • This verifies the key without having to start a Windows installation
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You can use a utility like

on your machines and compare them.

Unless you mean it may be used elsewhere and you have no idea where

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