Fix You’ll need a new app to open this while opening windows defender

Many users complained that when they are trying to open windows security, they get an message saying You’ll need a new app to open this. When they click the OK or Next option on the pop up, the pop window goes away. If you are also a victim of this bug, here is a working fix to solve this problem. The main issue users are facing is that even if they are able to open Microsoft windows defender, but they are unable to open some of its features. When they try to open some of the features like controlled folder or anything else like that, they encounter a Pop up stating the error which says , you will need a new app to open this . Surprisingly they have windows defender , turned on and enabled by default. So, here is a quick fix which solves this issue immediately.

You Need New App Open Windows Defender

Note: – Sometimes Just restarting your computer get rid of this issue. So go ahead and reboot PC. If this don’t help, try the fixes given below

Fix 1 – Reset Windows security using settings

1 – Search Windows security in Taskbar search box of Windows computer

2 – Do a right click and click on App settings

windows security min


3 – Now, click on Reset to reset Windows security

reset security min


Fix 2 –  Try Resetting Windows security using powershell

1 – Go to Windows taskbar search and search Powershell in the search box.

2 -Now, do a right click on Powershell icon and then select run as administrator

Windows Powershell Admin Min


3 – After that, copy and paste the following command given below and press Enter key to execute the command and reset windows security.

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

4 – Close the Powershell window and try again.

Fix 3 – Another Powershell command

1 – Search Powershell in the search box of Windows PC

2 -Now, right click on Powershell icon appearing in the search and then click run as administrator

Windows Powershell Admin Min


3 – After that, copy and paste the following commands given below one by one and press Enter key each time to execute the commands.

Case 1 – For Windows 10 users

Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Case 2 – For Windows 11 users

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

Close the Powershell window by clicking on the cross icon and try again

Fix 4 – Using Powershell disable development mode

1. Search Powershell in the windows 10 taskbar search.

2. Right click on the powershell icon and choose run as administrator.


Powershell Run As Administrator


3. Now, copy and paste the code given below and Hit Enter Key to execute the command.

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

That’s it. Now, you will no more receive this error.

Fix 4 – If you have any third party security app, disable it

If you have by any chance , any third part antivirus app installed on your windows computer, either disable it or uninstall it and check whether or not its interfering with windows defender app.

Also Read: How to disable windows defender

29 thoughts on “Fix You’ll need a new app to open this while opening windows defender”

  1. This is what i recieved

    Add-AppxPackage : Cannot find path
    ‘C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml’ because it does
    not exist.
    At line:1 char:1
    + Add-AppxPackage -Register -DisableDevelopmentMode “C:\Windows\SystemA …
    + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo : ObjectNotFound: (C:\Windows\Syst…ppXManifest.xml:String) [Add-AppxPa
    ckage], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.Windows.Appx.PackageManager.Commands.AddAppxPac
    I know nothing about Powershell. But i know how to follow instructions, So what did I do incorrectly?

  2. Amazing! Instant fix after reading all the MS MVPs who are “here to help”.
    Thanks so much.

  3. This worked. Thanks a lot. I also don’t normally comment, but this was really annoying me. What is causing this bug though? Anyway, cheers again.

  4. I usually don’t comment on websites, but I want to thank you for this quick and straight fix!
    I have bookmarked this site.

  5. I don’t normally comment on stuff, but thank you! That was a straight to the point fix that worked for my PC!

  6. Bro,

    Thank you so much.
    My problem got resolved. Now I can Open my Windows Security.

    Its just an easiest way.

Comments are closed.