Solved How do I restore Windows Defender?


garlin said:
Maybe try resetting the Appx package:
Code: 
powershell -C "Get-AppxPackage *Microsoft.SecHealthUI* | Reset-AppxPackage"
Click to expand...
Thaanks, fixed this. For some reason, all store apps changed language.
 

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I believe when sometimes you reset Windows, the SYSTEM profile gets a different locale assigned. Then various parts of Windows take the SYSTEM profile's settings instead of your own preferences.
 

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Glad you got it working. I am surprised that the inplace repair didn't fix it though.

Wonder why. For me that has usually undone any amount of corruption or weirdness.

But as others have said, we don't know the lengths of what was originally done to remove defender.
 

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I cannot install a cumulative update now. It goes to 97% and then reports an error, rolls everything back.
 

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I again have a problem. I rolled back my system because it did not update. So now I have to repeat all this restoration process. But I cannot: the registry file for Windows Defender does not import despite I run Regedit under Trusted Installer. Also, the UAC works, but I cannot control it because the UI does not start without Defender service running.

P.S. Regedit runs under System, not Trusted Installer. It seems, due to the update I cannot run regedit as TI.
 

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Your system sounds permanently screwed.

I would backup your user data. Boot from an updated ISO, do an "upgrade install" so it keeps your existing programs and moves Windows to Windows.old.
 

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Even Advanced Run cannot run a regedi as Trusted Installer, only as System, which is not enough. Maybe, UAC is the culprit. But I cannot disable UAC.
 

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Anixx said:
I again have a problem. I rolled back my system because it did not update. So now I have to repeat all this restoration process. But I cannot: the registry file for Windows Defender does not import despite I run Regedit under Trusted Installer. Also, the UAC works, but I cannot control it because the UI does not start without Defender service running.
Click to expand...
I would just clean install at this point, but that's just me.
 

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andrew129260 said:
I would just clean install at this point, but that's just me.
Click to expand...
Why? I just cannot import a registry key. Because no utility to run a program as trusted installer works after update.
 

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Okay, defender is seemingly running, but the security control panel is again blank.
 

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Re-register it.
Code: 
powershell -C Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
 

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garlin said:
Re-register it.
Code: 
powershell -C Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
Click to expand...
Cannot find path
C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\Ap
pXManifest.xml because it does not exist.
 

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Did the C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy folder disappear?
 

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garlin said:
Did the C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy folder disappear?
Click to expand...
There is no such folder...
 

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Maybe you are super-infected. An upgrade doesn't remove this folder.
 

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garlin said:
Maybe you are super-infected. An upgrade doesn't remove this folder.
Click to expand...
What happened: Windows Defender worked well. Bot an update of the system failed. So, I rolled back. Installed update. But noticed that the security service now works despite I did not enable it after rollback. So, I could not import registry values for Windows Defender service. No program allows to run regedit as Trusted Installer. Yet, after some time I noticed that Windows Defender service is working. So, as the both services are working, I re-installed the appx package. But the window is blank.
 

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You probably can't change any settings if Tamper Protection is enabled. This prevents "unauthorized" changes even if you're TI.

Boot into Safe Mode, and try again after disabling the Defender services.
 

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garlin said:
You probably can't change any settings if Tamper Protection is enabled. This prevents "unauthorized" changes even if you're TI.

Boot into Safe Mode, and try again after disabling the Defender services.
Click to expand...
Yea, maybe installing of the unauthorized appx package is prevented by Windows Defender. First time I ran it when Windows Defender was disabled.

But will it install under safe mode?...
 

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Anixx said:
No program allows to run regedit as Trusted Installer
Click to expand...

You could try Sordum PowerRun (It’s free) just as a last attempt. HAs always worked for me.

www.sordum.org

PowerRun v1.8 (Run with highest privileges)

PowerRun is a tool to launch any program/script files with the same privileges as the TrustedInstaller /SYSTEM. it is a Portable and free
www.sordum.org www.sordum.org

Click System Tools and select RegEdit.

IMG_5299.webp
 

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No the point is you wanted to re-import the Defender settings. If Tamper Protection is enabled, Defender protects the registry from Defender reg changes. So you have to disable Defender to change Defender...

Tamper Protection works on the kernel level, above anything TI (PowerRun or whatever can do).
 

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