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Windows Security not working on Windows 11? Quick fix 🔧💻

MasterTrend Insights by MasterTrend Insights
November 11, 2025
in Tutorials
Reading time:5 min read
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Contents

  1. Windows Security not working: 5 tricks to fix it NOW 🛡️⚡
  2. 1. Restart your Windows 11
  3. 2. Close other Security Programs
  4. 3. Restart the Security Center Service
  5. 4. Run SFC and DISM Scan
  6. 5. Reset the Windows Security Application
  7. 6. Reset your Windows 11 PC

Windows Security not working: 5 tricks to fix it NOW 🛡️⚡

Although Windows Security is a reliable security application, it still has some bugs that prevent users from performing a scan. Additionally, many users have recently reported that the application Windows Defender won't open after upgrading to Windows 11. 🛡️💻

If you're using Windows 11 and the security app isn't working, it's critical to identify and fix the problem as soon as possible. 🕵️‍♂️

1. Restart your Windows 11

Restart your Windows 11

Si estás enfrentando problemas como que Windows Security no se abre o que no puedes ejecutar un escaneo, el primer paso es reiniciar tu computadora. 🤔 A menudo, esta acción se pasa por alto, pero puede resolver la mayoría de los problemas.

Before continuing with the next methods, be sure to restart your PC. Click the power button and select Restart. 🔄

2. Close other Security Programs

Si Windows 11 detecta una herramienta de seguridad de terceros, desactiva automáticamente Windows Security. Si acabas de instalar un nuevo programa de seguridad en tu Windows 11, no podrás activar la protección que ofrece Windows Security. 🚫

So, to perform a full scan or enable Windows Security real-time protection, you'll need to disable your other third-party security software. 🔒

3. Restart the Security Center Service

The Security Center service is responsible for the real-time protection provided by the Windows Security app. If this service is disabled, the app won't work. Therefore, it's recommended to restart the service. 🔄

1. Press the keys Windows + R on your keyboard. This will open the Run dialog box.

Run dialog box

2. In the Run dialog box, type services.msc and press the button Enter.

services.msc

3. In Windows Services, look for Security Center.

Security Center

4. Right-click on the Security Center and select Restart.

4. Run SFC and DISM Scan

SFC (System File Checker) and DISM (Servicing and Deployment Image Management) are command-line tools that help find and repair corrupted system files. Corrupt system files can prevent Windows Security from working properly. You can run these two commands to resolve possible corrupted system files. ⚙️🛠️

1. First, click on the Windows 11 search and type Command Prompt. Right-click on Command Prompt and select Run as administrator.

Run as administrator

2. At the Command Prompt, enter sfc /scannow and press the button Enter.

sfc /scannow

3. The system file checker utility will run and attempt to replace corrupted system files. If it returns an error, you'll need to run another command:

DISM /Online /Cleanup-Image /ScanHealth

Run SFC and DISM 3 scan

These two commands will likely fix the Windows Security app not working issue on your Windows 11 PC. ⚙️✅

5. Reset the Windows Security Application

Although Windows Security es una aplicación del sistema, aún puedes restablecerla si no está funcionando correctamente. Aquí te mostramos cómo puedes restablecer la aplicación Windows Security. 🔄🛡️

1. Open the application of Configuration and click on Apps.

Apps

2. On the right side, click on Installed apps.

Installed apps

3. Find the Windows Security app and click on the three points beside.

three points

4. In the menu that appears, select Advanced options.

Advanced options

5. On the next screen, click on Restore.

Restore

6. Reset your Windows 11 PC

If none of the methods work, you'll need to reset your Windows 11 PC. Reset Windows 11 It will restore your PC to its factory state, but it will also remove all the apps installed on your device. ⚠️

Make sure to back up your essential apps and files before resetting Windows 11. This will prevent data loss. 📂

1. Click on the Windows 11 start menu and select Configuration.

Configuration

2. In the Settings app, navigate to System > Recovery.

System > Recovery

3. On the Recovery screen, click the option Reset PC.

Reset PC

4. Select whether you want to keep your files or delete everything in the next prompt. It is recommended to choose the option Keep my files.

Keep my files option

After the reset, try running the Windows Security app again. This time, the app will work correctly. Now, follow the on-screen instructions to complete the reset process. 🌟

These are some of the best ways to fix the Windows application crashing problem. Security not working on Windows 11. These methods will surely resolve issues related to the Windows Security app on your PC. If you have any questions about the Windows Security app, please feel free to let us know. 💬

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