Fixed: Windows Defender Start Actions Not Working Windows11/10

Troubleshooting Windows Defender's "Start Actions" Failure: Effective Solutions

This guide provides solutions for resolving the issue where Windows Defender (Windows Security) fails to initiate recommended actions after detecting threats. The error typically manifests as a message indicating threats but with an unresponsive "Start actions" button.

The problem can stem from various causes, including insufficient administrative privileges, a disabled Windows Defender service, incorrect settings, or conflicts with other security software.

Solution 1: Restart the Windows Defender Service

A disabled Windows Defender service prevents proper functionality. Here's how to check and restart it:

1. Search for "services" and press Enter.
2. Locate "Windows Defender Advanced Threat Protection Service," double-click to open its Properties.
3. Set "Startup type" to "Automatic" and click "Start."
4. Click "Apply" then "OK."

Solution 2: Verify Group Policy Settings

Incorrect Group Policy settings can also cause this problem. Follow these steps to verify:

1. Press Win R, type gpedit.msc, and click OK to open the Local Group Policy Editor.
2. Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus.
3. Double-click "Turn off Microsoft Defender Antivirus" and select "Not Configured."

Solution 3: Check the Windows Registry

Incorrect registry settings might be the culprit. Check this by:

1. Search for "regedit" and press Enter.
2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.
3. Right-click the DisableAntiSpyware key and select "Delete."

Solution 4: Disable or Uninstall Conflicting Security Software

Third-party antivirus programs can conflict with Windows Defender. Disable or uninstall any other security software installed on your PC. To uninstall, go to Control Panel > Uninstall a program, right-click the software, and select Uninstall.

Solution 5: Log in with an Administrator Account

Insufficient privileges can prevent Windows Defender from functioning correctly. Ensure you're logged in with an administrator account.

Solution 6: Run SFC and DISM

Corrupted system files can cause this issue. Try these commands in an elevated Command Prompt:

1. sfc /scannow
2. If the above doesn't work, run: DISM.exe /Online /Cleanup-image /Restorehealth

Conclusion

By systematically trying these solutions, you should be able to resolve the "Start actions" failure in Windows Defender and effectively address detected threats. Remember to restart your computer after each attempted fix.

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