Try to re-register Windows Security.
Execute this command in Windows PowerShell:
Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
Windows 11 Security not working, stuck on blue icon blank screen? Exhausted every option.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(288, 23%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
A
0
Reputation points
Hello Microsoft,
I have just updated to Windows 11 and my Windows Security no longer works. Every other feature seems to work normally.
I have tried:
- SFC /scannow + other command prompts copy and pastes. SFC /scannow always told me that there is no file corruption.
- Repairing + Resetting inside the System --> App --> System Components --> Advanced Options.
- Restarting my computer numerous times after implementing attempted fixes.
- Restarting the security service through services.msc.
Please help me, Microsoft community. I have exhausted almost every single option that I could find on this issue.
I have attached a screenshot of what I encounter down below. It stays on this screen for like 10-20 seconds, then just closes away and disappears on its own:
Windows for home | Windows 11 | Security and privacy
2 answers
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Kapil Arya 35,891 Reputation points Volunteer Moderator2025-10-18T15:48:28.92+00:00 -
A 0 Reputation points
2025-10-20T01:32:16.76+00:00 Hi Kapil,
I tried running the command and this error popped up:
"
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-AppxPackage], ItemNotFou ndException + FullyQualifiedErrorId : PathNotFound,Microsoft.Windows.Appx.PackageManager.Commands.AddAppxPackageCommand
"
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A 0 Reputation points
2025-10-21T13:21:14.67+00:00 Any updates?
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Ramesh Srinivasan 171.5K Reputation points Volunteer Moderator2025-10-21T13:25:08.65+00:00 To analyze the issue, please download defender_diag.bat
Right-click on the downloaded file, click Properties, select "Unblock" (if it exits), and OK. Then, run the enclosed batch file as an administrator.
Source: GitHub
Note: I'm the author of that batch file. It doesn't modify anything on your system. Here's the VirusTotal analysis for the file: https://www.virustotal.com/gui/url/2536a7ed1ed0cd7680b9717cfe67ac54ecf62abe5ec62e05747a90e2ad931208
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A 0 Reputation points
2025-10-25T13:45:11.37+00:00 Hi Ramesh,
I have just done what you instructed to do. What do I do now? It gave me a 'defender.log' file
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