I just completed a fresh install of Windows 8 Pro as it was released to MSDN. Installation went without a hitch however I can't find out where to enter the correct product key for the copy I have.

Clicking on the Activate this Computer in Activity Centre displays the following screen, but no option to change the product key:

Windows 8 Activation Screen

  • Have you checked out this link.
    – avirk
    Commented Aug 18, 2012 at 12:30
  • @avirk Please post a detailed answer including that link and I will accept the answer. Commented Aug 18, 2012 at 12:37
  • Diago as you said Done! :)
    – avirk
    Commented Aug 18, 2012 at 12:44

3 Answers 3


Just follow these steps to add/change product key using Command Prompt and slmgr.vbs:

  1. Launch Command Prompt as an Administrator.

  2. At the command prompt, type in slmgr.vbs -ipk(insert your product key here) and click Enter.

  3. To activate windows, type in slmgr.vbs -ato and click Enter.

All information form this Source


The command to display the GUI for changing the product key is slui 3 (you need to run the cmd.exe as an administrator).

  • 4
    Welcome to Superuser. I edited your answer, please refrain from posting rants and such, please check the FAQ, too. Feel free to edit your question again if you want to add something.
    – Baarn
    Commented Aug 28, 2012 at 20:22
  • That's a much more convenient way to do this, thanks!
    – Zaroth
    Commented May 29, 2015 at 9:00

You can also go to System (Win+Break) and click the "Change product key" link at the bottom. This works in both Windows 7 and 8.

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