Hi this post is to help people with windows 10 and 11 windows security not working On windows 11 do this launch powershell as an admin Set-ExecutionPolicy Unrestricted Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"} Set-ExecutionPolicy restricted IGNORE THE ERRORS on windows 10 do this launch powershell as an admin} run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage if it doesn't work do this 4) run Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml" run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Still looking for answers? I was too. None of the Powershell fixes worked for me. I finally found my fix here: https://www.winhelponline.com/blog/need-new-app-open-windows-defender-link/#download The downloads listed are not hosted by Microsoft but they are properly signed my Microsoft and scanned clean for me. Basically I had to redownload and reinstall both Microsoft.UI.Xaml (Microsoft.SecHealthUI_8wekyb3d8bbwe.appx) and Microsoft.SecHealthUI (Microsoft.UI.Xaml.2.4_2.42007.9001.0_x64__8wekyb3d8bbwe.appx)... afterward the Security app opened as it should.

command prompt will not work you have to use power shell as admin

Tripp - this is what I see on Win11 when I start the procedure: PS C:\WINDOWS\system32> Set-ExecutionPolicy Unrestricted Execution Policy Change The execution policy helps protect you from scripts that you do not trust. Changing the execution policy might expose you to the security risks described in the about_Execution_Policies help topic at https:/go.microsoft.com/fwlink/?LinkID=135170. Do you want to change the execution policy? [Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "N"): I assume that I should reply Y or A, but would appreciate it if you could provide a complete answer for us dummies who want to make sure that we don't mess anything up trying to fix this bug. Thanks!

not sure what bug you have as you can't replace the windows security files ( not sure why ) cause you can't modify the owner ship of the folders you might need to reset your computer.

This worked. And I found an answer on the Microsoft help forums. You seem to know a thing or two - they should hire you instead of their previous...interesting....tech support folks.

"You'll need a new app to open this windowsdefender link" fix

Anonymous

Hi this post is to help people with windows 10 and 11 windows security not working

On windows 11 do this

launch powershell as an admin
Set-ExecutionPolicy Unrestricted
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Set-ExecutionPolicy restricted

IGNORE THE ERRORS

on windows 10 do this

launch powershell as an admin}
run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
if it doesn't work do this
4) run Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

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Anonymous

2023-03-01T15:45:05+00:00

Still looking for answers? I was too. None of the Powershell fixes worked for me.

I finally found my fix here: https://www.winhelponline.com/blog/need-new-app-open-windows-defender-link/#download

The downloads listed are not hosted by Microsoft but they are properly signed my Microsoft and scanned clean for me.

Basically I had to redownload and reinstall both Microsoft.UI.Xaml (Microsoft.SecHealthUI_8wekyb3d8bbwe.appx) and Microsoft.SecHealthUI (Microsoft.UI.Xaml.2.4_2.42007.9001.0_x64__8wekyb3d8bbwe.appx)... afterward the Security app opened as it should.
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Anonymous

2022-02-20T16:56:45+00:00

command prompt will not work you have to use power shell as admin
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Anonymous

2022-05-17T07:20:48+00:00

Tripp - this is what I see on Win11 when I start the procedure:

PS C:\WINDOWS\system32> Set-ExecutionPolicy Unrestricted

Execution Policy Change

The execution policy helps protect you from scripts that you do not trust. Changing the execution policy might expose

you to the security risks described in the about_Execution_Policies help topic at

https:/go.microsoft.com/fwlink/?LinkID=135170. Do you want to change the execution policy?

[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "N"):

I assume that I should reply Y or A, but would appreciate it if you could provide a complete answer for us dummies who want to make sure that we don't mess anything up trying to fix this bug.

Thanks!
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4 people found this answer helpful.

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Anonymous

2022-02-20T16:55:49+00:00

not sure what bug you have as you can't replace the windows security files ( not sure why ) cause you can't modify the owner ship of the folders

you might need to reset your computer.
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Anonymous

2022-04-26T14:17:15+00:00

This worked. And I found an answer on the Microsoft help forums. You seem to know a thing or two - they should hire you instead of their previous...interesting....tech support folks.
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3 people found this answer helpful.

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