Windows 10: Windows Defender service does not start

Summary

Windows Defender service does not start

Issue

I had an issue in Build 10041 of the Windows 10 Technical preview where the Windows Defender service would not start because of previously installed Antivirus software (F-Secure Client Security 11.51 build 101).

Windows10_DefnderServiceFail_25042015

Bear in mind that services such as Windows Defender and Windows Firewall will automatically turn themselves off when you install Antivirus or Firewall software. This is by design to avoid conflicts.

If you don’t fall into the above category please read on.

Resolution

Fortunately the fix is very simple and can be found here:

http://wind8apps.com/windows-defender-windows-10-problems/

 

To remove the annoying popup simply delete the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\”WindowsDefender”

Windows10_DefnderRegEdit_25042015

Make sure you backup your key just in case you would like to restore it.

Updates:

27/04/2015 – Remove Windows Defender not running pop-up

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