windows security won't open on windows 11

dali soula 20 Reputation points
2026-07-22T00:56:11.25+00:00

hi everyone
gonna keep it short
for a while now, i have been unable to open windows security in any way.
when i open it from search bar, all i get is a blank window with windows security logo
and when i open it through the settings i just get nothing after the click
i've tried countless of solution i found online, including reinstalling windows through the recovery options ("fix problems using windows update" to be specific)
i'm open to try anything now, except for a full reinstallation through a flash drive (cuz i don't have one)

Windows for home | Windows 11 | Performance and system failures

Answer accepted by question author
Ramesh 181.2K Reputation points Volunteer Moderator
2026-07-23T18:48:01.8233333+00:00

Please do the following:

  1. Download sechealthfix_windows_11.reg and move it to the C:\ root.
  2. Download AdvancedRun from Nirsoft and run it.
  3. Using AdvancedRun, start Regedit.exe as TrustedInstaller. (see screenshot: https://ibb.co/gZgKmrR1)
  4. From the File menu in Regedit, choose Import..
  5. Dismiss the following error message dialog by clicking OK: enter image description here
  6. Browse to C:\ and import the REG file (sechealthfix_windows_11.reg) you downloaded in Step 1.
  7. Restart Windows.

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  1. Kapil Arya 38,451 Reputation points Volunteer Moderator
    2026-07-22T05:19:30.6266667+00:00

    Please try this command in admin Windows PowerShell:

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

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  2. Lester Bernard Reyes 84,815 Reputation points Independent Advisor
    2026-07-22T04:04:16.3033333+00:00

    Hi, I'm Bernard. I'm happy to help!

    This happens when there is a corrupted file in the Windows Defender folder or a reconfiguration is needed. First, you need to check if you have a work or school account:

    Open Settings> Click Accounts> Click Access work or school, then disconnect the account there. If no account or are already disconnected, and you have the same issue, follow the steps below:

    Note: Before doing the steps, I suggest completely uninstalling the third-party antivirus first.

    Method 1. Reinstall Windows Defender

    Open the registry, then go to:

    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
    
    
    

    Then delete the Windows Defender folder, restart the PC, and recheck it.

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