Right-click the Start button and select Windows Terminal (Admin).
Copy the handle exactly as shown here, then right-click the PowerShell windshield to paste it (Ctrl+V also works): Microsoft get-appxpackage.SecHealthUI -AllUsers | Reset AppxPackage.
Press Windows + press c in the control panel.
In the top right corner, click View and select Large Items.
Now click on Windows Defender from the list and try to enable it.
Press Windows + R to launch Command Prompt.
Under Windows Defender Service Processes, start the process and service.
Re: Can’t open Windows 11 security app.
Open PowerShell as an administrator. Copy and paste Microsoft get-appxpackage. SecHealthUI – AllUsers Reset-AppxPackage | Navigate to the desired PowerShell window and press Enter.
Microsoft Defender, based on Windows 11, provides comprehensive and robust malware protection, and it’s free. We love that users use it as their default standalone anti-malware program.
How to restore the Defender? On Windows, go to the Start menu and open Control Panel.
Click the Windows Defender tab and select Restore Defaults from the delayed Control Panel page.
Click the “Restore failed” button and confirm your action by simply clicking “Yes” in the confirmation window.
Skip to top.
Find the security windows and respond to the application.
Go to the Virus & Threat Protection section.
Locate the “Manage Settings” option.
Disable Real-Time Protection.
How to fix Windows not turning on Defender Solution 1: SFC scan. The SFC scan only checks the entire computer for missing/corrupt drivers and files on the laptop or computer.
Solution 2 – Turn on Group Policy
Enable Solution 3: Windows Defender Service.
Solution 4 – Check for updates
Solution 5 – Change the anti-spyware value in the registry 6:
Solution Perform a clean boot.
Solutions to Fix Error 0x80004004: Set Windows Defender to Automatic. If you set Defender to use automatically, you can fix all of these errors.
Temporarily disable the program for third-party security measures. This
Run System File Checker.
I’m Ahmir, a freelance writer and editor who specializes in technology and business. My work has been featured on many of the most popular tech blogs and websites for more than 10 years. Efficient-soft.com is where I regularly contribute to my writings about the latest tech trends. Apart from my writing, I am also a certified project manager professional (PMP).