How to Fix Windows Security Missing or Not Working (Windows 11)

Windows Security Center (or Windows Defender) is a comprehensive security control panel for Windows that contains basic system security information such as firewall status alerts, antivirus status alerts, and automatic update alerts. Recently, some users reported that after upgrading their computers to Windows 11, the security center disappeared or did not work properly. One of the manifestations is that it appears to be unable to open and jumps to the Microsoft App Store. Some users have also had nothing happen after trying to launch the application.

Such a situation can be caused by wrong configuration, updates, or Group Policy and services not running. You can try the following methods to fix Windows security.

1. Reinstall Windows Security using PowerShell

Press the shortcut key "Win+X" at the same time, and then choose to open PowerShell with administrator privileges.

Then type "Set-ExecutionPolicy Unrestricted" in the command window and press Enter to execute it. Note that after execution, an input option will pop up, just type "A" and enter.

Continue to enter the following command and press Enter to execute it.

After completion a red error report may appear, you can simply ignore it and continue to the next step.

Finally, execute the following command:

This should open the windows 11 security center

2. Reset Windows Security application

Press Win + I to open Settings and navigate to "Apps" - "Apps & features"

Search for and find "Windows Security" in the list of applications

Click on the three dots icon to open the advanced options and find the Reset section and click on the "Reset" button.

Once done, you should be able to open Windows Security as normal.

In addition to the above method, it is also possible that other third party security software exists that conflicts with Windows Security. You need to make a selection and leave only the one you want to use. You can also try using "sfc /scannow" and "Dism /Online /Cleanup-Image /RestoreHealth" in Windows Terminal to repair corrupted system files to fix the problem.