Learn the same with the step by step guide below: You’ll just have to download the Windows defender default registry file and then merge it to your system registry, the Windows defender service will be recreated. If the above given fixit is unable to fix the issue then you will need to re-create the Windows defender service using its default registry file. This Microsoft fixit automatically detects the issue and fixes it automatically. Run this Microsoft fixit to fix security related issues that could be in Windows Defender Security. Fix “Missing Windows Defender Service” Automatically

The first is automatically by running the download and running the default registry files or creating the entries manually. So fixing the registry entries could easily fix this issue. In fact, your system has lost windows defender service from registry as well.

I am wondering where my Windows defender is? I know very well that Windows 7 has Windows Defender service, can anybody please help me to get it back?

When I try to start, it says: “ Please turn on the Windows Defender Service” and when I go to service.msc to start it, there is no “Windows Defender” service listed in the services list. How to fix when Windows Defender Service is Missing