You’ll need a new app to open this windowsdefender

Nov - 21 2019 | By

If you have uninstalled a 3rd party antivirus software package on Windows 10, and when you try to check on Windows Defender you get the message You’ll need a new app to open this windowsdefender.

You can repair the Windows app Windows Defender in PowerShell

Click Start, type in PowerShell, right click the icon for PowerShell and choose Run as administrator.

Type in the following:

Add-AppxPackage -Register -DisableDevelopmentMode “C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml”

Press enter and when this command completes Windows Defender should now open.

For Windows 11 try the following command in PowerShell.

Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Press enter and when this command completes you can close PowerShell and Windows Defender should open.