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5. Scan for System File Corruption
Home Computer Tutorials Troubleshooting How to fix Windows Security not opening

How to fix Windows Security not opening

Aug 02, 2025 pm 12:02 PM
repair

Restart your computer to resolve temporary glitches. 2. Run the Windows Security Troubleshooter via Settings > System > Troubleshoot. 3. Ensure Security Center, Windows Defender Antivirus Service, and Windows Firewall are set to Automatic and running in services.msc. 4. Re-register the app using PowerShell with Reset-AppxPackage Microsoft.SecHealthUI, or reinstall it via AppXManifest.xml. 5. Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to fix system file corruption. 6. Boot into Safe Mode and scan for malware using a trusted antivirus tool. 7. Create a new user profile to check if the issue is profile-specific. 8. Install pending Windows updates to resolve compatibility issues. Most issues are caused by stopped services, app corruption, or system damage, and following these steps typically restores Windows Security functionality completely.

How to fix Windows Security not opening

If Windows Security isn’t opening on your Windows 10 or Windows 11 PC, it can leave you feeling exposed and frustrated—especially when you need to check your antivirus status or firewall settings. The good news is that this issue is usually fixable. Here’s a step-by-step guide to get Windows Security working again.

How to fix Windows Security not opening

1. Restart Your Computer

Before diving into complex fixes, try the simplest one first:

  • Restart your PC.
    Sometimes, a temporary glitch or background process conflict prevents Windows Security from launching. A reboot can clear this up instantly.

2. Run the Windows Security Troubleshooter

Windows includes built-in troubleshooters that can detect and fix common issues.

How to fix Windows Security not opening

Steps:

  • Press Win I to open Settings.
  • Go to System > Troubleshoot > Other troubleshooters.
  • Find Windows Security and click Run.
  • Follow the on-screen instructions and apply any recommended fixes.

This tool often resolves issues related to corrupted components or service interruptions.

How to fix Windows Security not opening

3. Check if Security Services Are Running

Windows Security relies on several background services. If they’re disabled or stopped, the app won’t open.

Steps:

  • Press Win R, type services.msc, and press Enter.
  • Look for these services:
    • Security Center (or Security Health Service)
    • Windows Defender Antivirus Service
    • Windows Firewall
  • For each:
    • Double-click it.
    • Set Startup type to Automatic.
    • If the service isn’t running, click Start, then Apply.

Restart your computer after ensuring all are running.


4. Re-register Windows Security via PowerShell

The Windows Security app is a modern UWP app. Re-registering it can fix launch issues.

Steps:

  • Right-click the Start button and select Windows Terminal (Admin) or PowerShell (Admin).
  • Paste the following command and press Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage

Wait for it to complete (no output means it worked).
Then try opening Windows Security again via Start menu or Win I > Privacy & security > Windows Security.

? If that doesn’t work, reinstall it instead:

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

5. Scan for System File Corruption

Corrupted system files can prevent Windows Security from launching.

Run these commands in Command Prompt (Admin):

sfc /scannow

Wait for it to finish (can take 15–20 mins). If it finds and fixes issues, restart.

Then run:

DISM /Online /Cleanup-Image /RestoreHealth

This repairs the Windows image. Restart again after completion.


6. Check for Malware

Some malware disables security tools to avoid detection.

  • Boot into Safe Mode with Networking.
  • Run a full scan using a trusted antivirus (like Malwarebytes or Microsoft Defender Offline).
  • Remove any threats found, then restart normally.

7. Create a New User Profile

Sometimes, the issue is tied to your user profile.

  • Create a new local administrator account:
    • Go to Settings > Accounts > Family & other users > Add account.
  • Log into the new account.
  • Try opening Windows Security there.

If it works, the problem is with your original profile—consider migrating data or fixing profile corruption.


8. Update Windows

Outdated system components can cause compatibility issues.

  • Go to Settings > Windows Update.
  • Install all pending updates.
  • Restart if needed.

Microsoft often pushes fixes for known bugs in cumulative updates.


Bottom line: Most Windows Security launch issues come from stopped services, app corruption, or system file damage. Start with the troubleshooter and services, then move to PowerShell and system scans if needed.

Basically, it's not usually serious—but it’s worth fixing quickly to keep your system protected.

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