In that case, (re)installing the Microsoft.SecHealthUI package ought to fix the problem. The above indicates that the package is not installed for your user account. + FullyQualifiedErrorId : .Commands.ResetAppxPackageCommand' + CategoryInfo : NotSpecified: (:), COMException + Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Use Get-AppxPackage to see the list of packages installed. Windows cannot remove Microsoft.SecHealthUI_1000.22000.1.0_neutral_8wekyb3d8bbwe because the current user does not have that package installed. Some users may get the following error instead: 'Reset-AppxPackage : Package was not found. You should be able to launch the Windows Defender security settings dashboard now. If you see the “Deployment operation progress:” message and end up with no error message/output, the command was successful. Run the following command and hit Enter: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

To reset and repair the Windows Security app in Windows 11, open PowerShell elevated (Run as administrator). Instructions for Windows 10 You’ll Need a New App to Open This Windows Defender Link Instructions for Windows 11 Option 1: Repair the Windows Security app

Verify if the Package has been installed correctly.Option 2: Reinstall “Windows Security” using the Installer file.Option 1: Repair the Windows Security app.

Windows defender not working windows 11