Solved How do I restore Windows Defender?


I’m sure there is a reason that you may have mentioned why you can’t. But It’s my personal opinion it’s time you did a totally fresh install of Windows. It sounds like a Cluster Duck.
 

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    Windows 11 Pro 25H2 Build 26200.8894Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz32.0 GB of I forget and the box is in storage.Gigabyte nVidia GeForce GTX 1660 Super OC 6GB
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    Sin-built 2013
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    I’m on a horse.

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    Windows 11 Pro 25H2 Build 26200.8894 (Wifes)13th Generation Intel® Core™ i5-1340P Process...16GB LPDDR5-52001x Intel® Iris® Xe Graphics
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    Windows 11 Pro 25H2 Build 26200.8894 (Wifes)
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    LENOVO Yoga 7 14IRL8 - Type 82YL
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    …still on a horse.


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  • Windows 11 Pro 25H2 Build 26200.8894 (Wifes)

    Yoga 7 2-in-1 14IML9 - Type 83DJ

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    Memory: 32GB LPD5X-7467

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    Ports: 1 x HDMI 2.1 TMDS; 1 x Novo Button; 1 x Combo Audio Jack
    2 x USB-C (USB 4.0)
    1 x USB-A 3.2 Gen 1

    Camera: 1080P FHD IR Hybrid with Dual Microphone

    Graphics: Intel® Arc™ Graphics

    Monitor: 14" 2.8K

    ...Where's my horse?
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...
Just rebooted in safe mode. There Windows Defender is still running and there is no way to stop it.
 

My Computer My Computer

At a glance

Windows 11
OS
Windows 11
garlin said:
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).
Click to expand...
No, my only desire was to import defender service key so it to run. If it is already running (restored by the Security service) there is no point.

The current issue is that the package Microsoft.SecHealthUI_1000.27703.1006.0_x64__8wekyb3d8bbwe.appx when I install it does not create C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy folder, which seems wrong. First time it worked well.
 

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Windows 11
OS
Windows 11
garlin said:
Did the C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy folder disappear?
Click to expand...
So, I rolled the system back, now it seems, no Defender or Security Health Service are running. When I install the appx package, the folder Microsoft.SecHealthUI_1000.27703.1006.0_x64__8wekyb3d8bbwe.appx is still not created... Why?
 

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Windows 11
OS
Windows 11
Sorry, it's "\Program Files\WindowsApps" for SecHealthUI.
 

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Windows 7
OS
Windows 7
garlin said:
Sorry, it's "\Program Files\WindowsApps" for SecHealthUI.
Click to expand...
Ah. So, the problem is simple: blank screen unlike the first time when it worked.
 

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Windows 11
OS
Windows 11
To sum it up:

1. The first time it worked:
* I did it before the update to the recent patches
* I ran appx package, it installed
* Then I run RunAsTI, imported Defender service reg settings, they imported successfully
* Then I enabled services SecurityHealthService and SecurityHost.
* The app started and worked.

2. Now:
* I cannot roll back before the update for the last 7 months, but can roll back to when Defender and SecurityHealth are disabled
* I run the appx package, it seemingly installs
* Then I run RunAsTI to import Defender service settings, but it reports access rights violation and does not import, even though the Defender service is not running. After this, UAC starts to pop up everywhere (UAC was at lowest level, that is, only UAC icons on buttons, but becomes above the lowest)
* Then I enable SecurityHealthService and SecurityHost.
* After they are enabled, over some time Defender starts as well, and its service registry entry automatically appears.
* The Windows Security app is still blank, even though all the 3 services are running.
 

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Windows 11
OS
Windows 11
Your OS version is simply Windows 11. That tells us nothing to help you.
If you really want help, then you need to tell us more about your computer and what version you started with when it was bought or when you acquired it.

You don't need to start new topics on this same subject!
 

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    Windows 11 Home 25H2 26200.8875AMD Ryzen 3 5300G8gbRadeon Graphics 4.00GHZ
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    Windows 11 Home 25H2 26200.8875
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    HP Pavilion TP01-2xxx
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    AMD Ryzen 3 5300G
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    Updated Windows 10 to 11 25H2 26200.8875Intel Core i3 8100 @3.60 GHz8.GBIntel UHD 360 (HP)
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    Updated Windows 10 to 11 25H2 26200.8875
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    #3 System: HP laptop Windows 25H2 11Pro 26200.8524
  • HP Omni laptop Windows 11 home
    11 25H2 26200.8737
    Intel Core 5 120U
Jacee said:
Your OS version is simply Windows 11. That tells us nothing to help you.
If you really want help, then you need to tell us more about your computer and what version you started with when it was bought or when you acquired it.

You don't need to start new topics on this same subject!
Click to expand...
In the first post I said: Win11 23H2.

Build number is 4890 (after update). When the topic was created, the build number was around 3500
 

My Computer My Computer

At a glance

Windows 11
OS
Windows 11
Anixx said:
To sum it up:

1. The first time it worked:
* I did it before the update to the recent patches
* I ran appx package, it installed
* Then I run RunAsTI, imported Defender service reg settings, they imported successfully
* Then I enabled services SecurityHealthService and SecurityHost.
* The app started and worked.

2. Now:
* I cannot roll back before the update for the last 7 months, but can roll back to when Defender and SecurityHealth are disabled
* I run the appx package, it seemingly installs
* Then I run RunAsTI to import Defender service settings, but it reports access rights violation and does not import, even though the Defender service is not running. After this, UAC starts to pop up everywhere (UAC was at lowest level, that is, only UAC icons on buttons, but becomes above the lowest)
* Then I enable SecurityHealthService and SecurityHost.
* After they are enabled, over some time Defender starts as well, and its service registry entry automatically appears.
* The Windows Security app is still blank, even though all the 3 services are running.
Click to expand...
Hi, I know this is an old thread but I registered just to leave a solution to this problem that took me hours to solve.

I managed to reboot to Safe Mode through the msconfig.
From there I was able to run regedit.exe using Sordum's PowRun tool and imported the registry which in my case is "w11-windefend.reg."
After rebooting, the blank window should be fixed.
 

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At a glance

Windows 11 23H2 22631.7079
OS
Windows 11 23H2 22631.7079
Computer type
Laptop
Manufacturer/Model
Legion Y7000P
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