Windows Security Not Opening

Hi rncn183,

Sorry to hear you're experiencing this issue!

Step-by-Step Troubleshooting

Step 1: Restart Your PC

Restart Your PC:

Sometimes, a simple restart can resolve issues with applications not opening properly. Restart your PC and try opening Windows Security again.

Step 2: Check for Windows Updates

Ensure Windows is Up to Date:

Go to Settings > Update & Security > Windows Update.

Click on Check for updates and install any available updates.

Restart your PC if any updates were installed.

Step 3: Run System File Checker (SFC) and DISM

Run System File Checker (SFC):

Press Win + X and select Windows Terminal (Admin).

Type the following command and press Enter:

shell

Copy code

sfc /scannow

Wait for the scan to complete and follow any on-screen instructions.

Restart your PC.

Run Deployment Imaging Service and Management Tool (DISM):

Open Windows Terminal (Admin) again.

Type the following commands one at a time and press Enter after each:

shell

Copy code

DISM /Online /Cleanup-Image /CheckHealth

DISM /Online /Cleanup-Image /ScanHealth

DISM /Online /Cleanup-Image /RestoreHealth

Wait for each process to complete.

Restart your PC.

Step 4: Reset Windows Security App

Reset the Windows Security App:

Go to Settings > Apps > Apps & features.

Scroll down and find Windows Security in the list.

Click on it and select Advanced options.

Scroll down and click Reset.

Step 5: Re-register Windows Security App

Re-register the Windows Security App:

Open Windows Terminal (Admin).

Type the following command and press Enter:

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

Restart your PC.

Step 6: Check for Conflicting Software

Check for Conflicting Software:

Sometimes third-party antivirus or security software can conflict with Windows Security.

Temporarily disable or uninstall any third-party antivirus software and try opening Windows Security again.

Please try these steps one at a time and let me know if any of them resolve the issue. If the problem persists, I have more solutions we can try.

Best regards,

Gyula H.

I have tried each step, but none of them seemed to have any effect. Trying to run System File Checker results in a message stating "Windows Resource Protection could not start the repair service.

tep 2: Use PowerShell to Reinstall Windows Defender

Reinstall Windows Defender via PowerShell:

Press Win + X and select Windows Terminal (Admin).

Run the following command to reinstall Windows Defender:

Add-WindowsCapability -Online -Name Microsoft-Windows-Defender-Default-Definitions

Wait for the process to complete and then restart your computer.

Step 3: Check and Start Windows Defender Services

Start Windows Defender Services:

Press Win + R to open the Run dialog box.

Type services.msc and press Enter.

Ensure that the following services are running and set to Automatic:

Windows Defender Antivirus Service

Windows Defender Advanced Threat Protection Service

Windows Defender Antivirus Network Inspection Service

Step 4: Reset Windows Security App

Reset the Windows Security App:

Go to Settings > Apps > Apps & features.

Scroll down and find Windows Security in the list.

Click on it and select Advanced options.

Scroll down and click Reset.

Restart your PC.

The error message "Windows Resource Protection could not start the repair service" typically indicates an issue with the Windows Modules Installer service, also known as the TrustedInstaller service. This service is necessary for running System File Checker (SFC). If this service is not running or is disabled, SFC cannot function properly. Let's go through some steps to address this issue.

Step-by-Step Solution

Step 1: Check and Fix Windows Modules Installer Service

Restart Windows Modules Installer Service:

Press Win + R to open the Run dialog box.

Type services.msc and press Enter.

Find Windows Modules Installer in the list.

Right-click it and select Restart. If the Restart option is greyed out, select Start.

Ensure the Startup type is set to Manual.

Step 2: Check Service Dependencies

Verify Dependencies:

In the Services window, right-click Windows Modules Installer and select Properties.

Go to the Dependencies tab and note all services listed.

Ensure that all dependent services are running.

Step 3: Enable Windows Defender Services

Start Windows Defender Services:

Press Win + R, type services.msc, and press Enter.

Ensure that the Windows Defender Antivirus Service and Windows Defender Firewall are running and set to Automatic.

Step 4: Use Safe Mode

Boot into Safe Mode:

Press Win + R, type msconfig, and press Enter.

Go to the Boot tab and check Safe boot.

Select Network and click OK.

Restart your computer.

Try running sfc /scannow in Safe Mode.

Step 5: Repair Windows Component Store

Run Component Store Repair:

Open Windows Terminal (Admin).

Run the following commands one by one:

DISM /Online /Cleanup-Image /StartComponentCleanup

DISM /Online /Cleanup-Image /AnalyzeComponentStore

DISM /Online /Cleanup-Image /RestoreHealth

Step 6: Check and Repair System Drive

Run Check Disk:

Open Windows Terminal (Admin).

Type the following command and press Enter: chkdsk C: /f /r /x

Follow the prompts to schedule the check on the next restart.

Restart your computer and let the check disk process complete.

Step 7: Perform a System Restore from Recovery Environment

Access Recovery Environment:

Boot your computer and repeatedly press F8 or Shift + F8 until you see the Advanced Boot Options.

Select Troubleshoot > Advanced options > System Restore.

Follow the prompts to restore your system to a point before the issue began.

Step 8: Use Windows Recovery Media

Create and Use Recovery Media:

If you have a Windows installation USB or DVD, boot from it.

Select Repair your computer.

Go to Troubleshoot > Advanced options > Command Prompt.

Try running sfc /scannow from the Command Prompt in the recovery environment.