How to install Product Key

[Sai Lochana R]

Hey Mates, Using 'slmgr.vbs/upk' ,I accidentally uninstalled product key .Now again I want to install product key how can I do so ,and even Recently I made the setup of Windows OS in my laptop and everywhere I encounter with errors like command not recognized even unable to install required software in system.Need an Advice .Thanks in advance ..!

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