windoes security does not open at all

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

Based on your inputs, it seems that there are corrupted system files on the PC or in Windows Defender. To sort out the issue, kindly follow the steps below:

Method 1. Repair Windows apps and Windows Defender:

On Terminal(Admin), copy and paste the command below and hit enter:

Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Restart the PC and check

Method 2. 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.

Note: If the issue persists, a system repair on the affected device might be necessary.

Hi Zaid,

Per Copilot, try this:

✅ Quick Fix: Reinstall Windows Security via PowerShell

This restores the Windows Security app (Microsoft.Windows.SecHealthUI).

Open PowerShell as Administrator

Run this command:

Code

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

If your Windows version doesn’t support Reset-AppxPackage, use:

Code

Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Foreach {
    Add-AppxPackage -Register "$($_.InstallLocation)\AppxManifest.xml" -DisableDevelopmentMode
}

This reinstalls the Windows Security interface.