- Remove any third-party antivirus tool from your PC.
- Try to reset, or re-register the Windows Security app (using PowerShell).
- Check if the group policies regarding Windows Security have been changed using the Group Policy Editor.
Fix 1: Remove Third-Party Antivirus
Some settings become unavailable in the Windows Security app after you install and run a third-party antivirus program on your PC. So, removing the third-party antivirus can help Windows Security regain full control.
Step 1: Press the Windows key to open the Start menu, type appwiz.cpl , and press Enter.
Step 2: Find the third-party antivirus in the list of installed programs. Right-click on it and select the Uninstall option.
Step 3: User Account Control will launch. Click on the Yes button.
Step 4: Click on the Remove/Uninstall option and follow the on-screen instructions to uninstall the third-party antivirus from your system.
Step 5: Restart your system.
Windows Defender protection will automatically kick in after you remove the third-party antivirus app.
Fix 2: Tweak the Registry
Multiple users solved the ‘some settings are managed by your system administrator’ issue by deleting a registry key from their system.
But before proceeding with this step, create a registry backup of your system and copy it onto a USB drive.
Step 1: Press the Windows key to open the Start menu, type regedit , and press Enter.
Step 2: User Account Control will open. Click on the Yes button.
Step 3: Go to the address bar, paste the following path , and press Enter:
HKLM\SOFTWARE\Policies\Microsoft\Windows Defender
Step 4: Right-click on the Windows Defender key and select the Delete option.
Step 5: Click on the Yes button.
Step 6: Close the Registry Editor and restart your system.
Fix 2: Reset Group Policy Editor Properties
You can make system-wide changes in Windows OS using the Group Policy Editor in every edition of Windows 11 except the Home version. So, if one or multiple policies related to Windows Security are changed using Group Policy Editor, you will see the error message and won’t be able to access the settings in the app. :
Step 1: Press the Windows + R keyboard shortcut to open the Run Dialog box. Type gpedit.msc in the text box and press Enter.
Step 2: Go to the left-hand side menu and click on the Computer Configuration section. Then, expand the Administrative Templates section and click on the Windows Components option.
Step 3: Click on the Microsoft Defender Antivirus option. Then, click on the Real-Time Protection option.
Step 4: Double-click on the Turn off real-time protection option to open its properties.
Step 5: Select the Not Configured radio button and click on the Apply button.
Step 6: Click on the OK button.
Step 7: Similarly, set all the policies listed on the page to Not Configured and close the Group Policy Editor.
Restart your PC to apply the changes.
Fix 4: Undo the Changes Made by a Third-Party Tool (Winaero)
Third-party Windows customization tools like Winaero Tweaker allow you to tweak many features in Windows OS that you normally cannot do using the Settings app.
But if you previously used this or any other tool to disable Windows Defender or any of its settings, you will see the “some settings are managed by your system administrator” error message. So, you must undo all those tweaks. Here’s how:
Step 1: Open the Winaero Tweaker app.
Step 2: Go to the top menu bar and click on the Actions button. Select the Reset all tweaks option.
Step 3: Winaero Tweaker will list all the changes you made to your PC. Select all tweaks and click on the Reset selected tweaks button.
Step 4: Restart your System.
Fix 5: Reset Windows Security
If all the above methods result in despair, you can try resetting the Windows Security app. Windows 10 and Windows 11 can repair or reset some system apps via Settings. It will remove all the changes and custom settings.
Step 1: Press the Windows key to open the Start menu, type Windows Security , and click on the App Settings option.
Step 2: Scroll down to the Reset section. Click on the Reset button. It may take a while to complete the action.
Step 3: Relaunch the Windows Security app and check if you see the same error message in Real-time Protection, Memory Integrity, or any other section.
Fix 6: Re-Register Windows Security App
You can re-register system apps via PowerShell in Windows. It removes the current installation of the system app and reinstalls it on your PC. Repeat the following steps:
Step 1: Press the Windows key to open the Start menu, type PowerShell , and press Ctrl + Shift + Enter keyboard shortcut.
Step 2: User Account Control will open. Click on the Yes button.
Step 3: Paste the following command in the PowerShell window, and press Enter:
Get-AppXPackage -AllUsers -Name Microsoft.SecHealthUI | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" -Verbose}
Step 4: You won’t see a confirmation message after the command executes. Close the PowerShell window.
