You’ll need a new app to open this windowsdefender

Strange error when you open the Windows defender settings in Windows.

A few users have reported the following error to us when clicking the Windows Defender settings.

You’ll need a new app to open this windowsdefender

Clicking on the Windows App Store does not help, as Defender cannot be found here. We have not managed to reproduce the error ourselves, but it can happen if you have installed another virus scanner and removed it from the system. Also, an activated development mode seems to play a certain role here.

As a remedy, one can find the tip on the Internet to repair the Windows Defender via the Powershell. To do this, open a Powershell via the Start menu with admin rights.

Windows 10

Now we run the following command:

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

Windows 11

In Windows 11 you get an error message that the path does not exist. Here, the following command is to be used:

Add-AppxPackage -Register -DisableDevelopmentMode "C:\Program Files\WindowsApps\Microsoft.SecHealthUI_1000.22000.1.0_neutral__8wekyb3d8bbwe\AppXManifest.xml"

Alternatively, various forums on the Internet also recommend the following command:

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

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