Windows 8 and 8.1 Forums


Windows Defender will not turn on

  1. #1


    Posts : 1
    Windows 8

    Windows Defender will not turn on


    I've spent more than two hours on trying to fix this mess. I did several fixes that did not work at all.

    It was working last night then I decided to refresh my PC. I installed several programs including drivers, windows updates and Malware Bytes (No Anti-virus installed).

    Today, I found out Windows Defender was not working. I did try launching it from search, action center, and attempted to manually start which clearly didn't work. It is set to automatic in services. All other tabs such as Update, History, and Setting are greyed out.

    I always get the response "The service couldn't be started. This programs service has stopped. You can start the service manually or restart your computer, which will start the service."

    I also deactivated UAC.

      My System SpecsSystem Spec

  2. #2


    Posts : 2,191
    Windows 8.1


    Any triggering events that lead up to your issue? Did you recently uninstall a 3rd-party AV? Any chance you have been infected by malware?
      My System SpecsSystem Spec

Windows Defender will not turn on
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