How to fix “You’ll need a new app to open this windowsdefender” Error in Windows 11 & 10
If you get this message while opening or enabling Windows Security then follow the steps in the video and your problem will be solved in 2 minutes.

Registry Path
Computer//HKEY_LOCAL_MACHINE//SOFTWARE//Microsoft//Windows Defender

Windows 11 Powershell command
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register /”$($_.InstallLocation)//AppXManifest.xml/”}

Windows 10 Powershell command
get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

If this doesn’t work on Windows 10, then run 2 commands below
Add-AppxPackage -Register -DisableDevelopmentMode /”C://Windows//SystemApps//Microsoft.Windows.SecHealthUI_cw5n1h2txyewy//AppXManifest.xml/”

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

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