Use this slmgr command to remove the product key from Windows Registry. There's a limit to how many times you can rearm the Windows activation files. The rearm command resets activation timers, which essentially lets you use Windows without activating it by extending the trial.įor example, if you're using Windows on a day trial, this one-month limitation can be reset back to the beginning after entering this slmgr command.Ī restart of your computer is required to complete this command.
You'll see a message that says Windows is activated if it is, or be given a date if it's not permanently activated, or see an error if no product key has been provided. Use this slmgr command to see if Windows is activated. A regular Command Prompt can work for some of these tasks but others - ones that involve changing data and not just displaying it - require an elevated Command Prompt.
After opening Command Promptenter the desired slmgr command like you see in these examples.
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