How to fix this issue?

Shyam Bishwokarma 0 Reputation points
2026-09-03T16:51:41.8+00:00

Screenshot 2026-09-03 212359

I tried all idea I had but I am not able to fix this issue.

I already tried Powershell, command and Securityhealthsetup.exe

Microsoft Security | Microsoft Defender | Other
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AI answer

2026-09-03T16:52:02.14+00:00

If Windows Security opens but shows Page not available, and PowerShell, Command Prompt, and SecurityHealthSetup.exe already did not fix it, the supported next steps from the available guidance are:

  1. Run the Windows Security troubleshooter
    • Download the troubleshooter from the Microsoft Support article.
    • Run it and let it check and enable security features such as UAC, DEP, Windows Firewall, SmartScreen, and antivirus protection status.
  2. Check whether Microsoft Defender Antivirus services are running
    • Open PowerShell as administrator and run: 
           Get-Service WinDefend, WdBoot, WdFilter, WdNisSvc, WdNisDrv, SecurityHealthService, wscsvc | Format-Table -Auto DisplayName, Name, StartType, Status
    • Expected key services include:
      • SecurityHealthService = Running
      • WinDefend = Running
      • wscsvc = Running
    • If these are stopped, continue with the next steps.
  3. Rule out third-party antivirus interference
    • If Microsoft Defender Antivirus is intended to be the primary antivirus, uninstall any non-Microsoft antivirus software.
  4. Reset Microsoft Defender Antivirus platform and definitions
    • Open an elevated Command Prompt and run: 
           MpCmdRun.exe -RemoveDefinitions -All
     MpCmdRun.exe -ResetPlatform
    • Then run Microsoft Update.
  5. If system files are damaged, repair the Windows image
    • Open Command Prompt as administrator and run: 
           dism /online /cleanup-image /restorehealth
     sfc /scannow
    • If DISM fails with a file source error, use an accessible install.wim source as documented.
  6. If the issue started after malware damage or missing Defender platform files, perform a repair install
    • The available guidance indicates that when malware has removed Windows Defender platform files, an in-place repair installation of Windows while keeping apps and personal files can fix Windows Security.
    • Important: if Keep personal files and apps is greyed out during setup, stop the repair attempt.
  7. If PowerShell or Command Prompt are blocked by policy or security software, temporarily unblock them only for repair
    • Microsoft documents that installation and repair actions can fail when PowerShell.exe is blocked by policy or security software.
    • This requires administrator permissions.

References:

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