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Reset Windows Activation/Remove license key


Open a command prompt as an Administrator (in the search bar type cmd then right click and "open as administrator").

  1. Enter slmgr /upk and wait for this to complete. This will uninstall the current product key from Windows and put it into an unlicensed state.
  2. Enter slmgr /cpky and wait for this to complete. This will remove the product key from the registry if it's still there.
  3. Enter slmgr /rearm and wait for this to complete. This is to reset the Windows activation timers so the new users will be prompted to activate Windows when they put in the key.

This should put the system back to a pre-key state. You can now install your new windows licence.


Ouvrez une invite de commande en tant qu'administrateur (dans la barre de recherche tapez cmd puis clique droit et "ouvrir en tant qu'administrateur").

  1. Entrez slmgr /upk et attendez que cela se termine. Cela va désinstaller la clé de produit actuelle de Windows et la mettre dans un état sans licence.
  2. Entrez slmgr /cpky et attendez que cela se termine. Cela supprimera la clé de produit du registre s'il est toujours présent.
  3. Entrez slmgr /rearm et attendez que cela se termine. Cela permet de réinitialiser les minuteurs d'activation de Windows afin que les nouveaux utilisateurs soient invités à activer Windows lorsqu'ils placent la clé. 

Cela devrait remettre le système dans un état de pré-clé. Vous pouvez maintenant installer votre nouvelle licence Windows.

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