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To further verify if Windows Defender is successfully installed, click on the “ Open Windows Security” button to open the Windows Security window. This should open up the Windows Security (Windows Defender) settings like it used to.

Now, you can press Win + i keys to open Settings and go to Privacy & security > Windows Security. Once completed, the progress message will disappear and Windows Terminal will start at a new line, which indicates the previous command has been executed. It may take a while for the process to complete. Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackageĪfter executing the command, Windows Terminal will begin to reset Windows Defender and show a progress message that says “Deployment operation progress”. Once you have an elevated (admin) Windows Terminal or PowerShell window opened, enter the following command to reset and reinstall Windows Defender in Windows 11. Then, right-click Windows PowerShell from the search result and select Run as administrator. To do so, right-click the Start button on the taskbar and select “ Windows Terminal (Admin)“.Īlternatively, you can search for PowerShell through Start menu. Thus, you will need to first open Windows Terminal or PowerShell with admin rights. However, you will need administrator rights to be able to execute the command. You can reinstall Microsoft Windows Defender in Windows 11 by executing a single line of command through PowerShell or Windows Terminal. How to enable Windows Defender if you already have an existing antivirus software.PowerShell shows errors when executing the command.Reinstall Windows Defender in Windows 11.