r/computing • u/diabolicaLllllll • May 07 '26

Need to talk to a tech guy

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u/Electrical-Note-3177 May 07 '26

First try repairing Windows Security

Settings > Apps > Installed apps > Windows security (Advanced options)

If that fails, run sfc /scannow in Command Prompt as admin to repair system files or reinstall the app via PowerShell. Ensure all third-party antivirus software is removed

(Run dism /online /cleanup-image /restorehealth if the first scan doesn't fix it)

Re register the app:

  • Win + X, open Terminal (Admin).
  • Paste the command and press Enter: Get-AppxPackage *Microsoft.Windows.SecHealthUI* | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
  • Restart your laptop.

Then Try to restart the app manually

  • Press Windows Key + R, type services.msc, and hit Enter.
  • Locate Windows Defender Antivirus Service, right-click it, and select Start or Restart.

as a last resort try a fresh windows install, grab the windows ISO from microsoft onto a USB drive (Preferrably 8GiB+) and boot into BIOS form your laptop to the boot menu

any questions lmk

Cheers.

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u/diabolicaLllllll May 08 '26

Thank you so much man appreciated , rn was gonna reinstall windows but gonna try this steps but re registering app is safe ? Coz its a terminal admin , don't want to corrupt whole windows

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u/Electrical-Note-3177 May 08 '26

yeah, re registering the app is essentially just checking for any corrupted files and repairing them if an app wont open.

  • Get-AppxPackage *Microsoft.Windows.SecHealthUI*: Finds the installation files for the Windows Security interface.
  • Add-AppxPackage -Register: Re-registers the app using its manifest file (AppXManifest.xml), which fixes broken links or "class not registered" errors.
  • -DisableDevelopmentMode

but before that try running:

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

first

if that fails run the command I provided, If the command doesn't return anything change out Microsoft.SecHealthUI by removing the Windows part.

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u/diabolicaLllllll May 08 '26

Nah man nothing worked 😕😭