Step 1. press Windows and search cmd, right-click and run as administrator.
Step 2. Now type this command on command prompt slmgr /upk or slmgr.vbs /upk
(This command uninstalls the product key)
Step 3. Now type this command on command prompt slmgr /cpky or slmgr.vbs /cpky
(This command uninstall the product key from registry)
Step 4. Now type this command on command prompt slmgr /rearm
(This command reset the Windows activation timers)
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