To uninstall or deactivate windows product key, you only need two cmd commands on an elevated cmd session. You might want to uninstall windows product key in order to install a new product key you purchased or current installed product key is having issues like unable to activate windows, used key etc...
Steps:
Step 1 of 2: Open cmd as admin
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Step 2 of 2: Type the following commands one by one
slmgr /upk
slmgr /cpky
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Done!
slmgr /upk Command is to unsintall product key from windows
slmgr /cpky command is to clear product key from registry
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