Windows 10: Windows defender service won't start (build 9860)

  1.    30 Oct 2014 #1

    Windows defender service won't start (build 9860)

    Hi there

    Anybody encountered THIS problem yet (I have no other AV software running).

    Windows defender won't start.

    Attached Thumbnails Attached Thumbnails security.jpg  
      My ComputerSystem Spec

  2. Layback Bear's Avatar
    Posts : 994
    Windows 7/64 Professional
       30 Oct 2014 #2

    Check Windows 10 time to make sure the time and date are correct. Some infection will change the time so you can't get updates.

    I'm presuming you have check for infections.
    Check and see if your other security programs have the same problem.
    Some infections will try to turn off all security programs.
    Some will also try to stop you from using the internet so you can't get help using that computer.
      My ComputersSystem Spec

  3. ThrashZone's Avatar
    Posts : 3,834
    3-Win-7Prox64 2-Win10Prox64
       30 Oct 2014 #3

    The only time I've seen that was after uninstalling Panda antivirus,
    Couldn't turn defender back on after,
    I had to do a refresh install with flash media to get it back on
      My ComputersSystem Spec

  4.    30 Oct 2014 #4

    Hi Jimbo,
    if you ran any AV, any registry remnants that remain will cause the error you are seeing.
    Its a case of hunting them down, usually hiding in users/roaming
    Found this out on my W7 install, its quicker than a reinstal.

      My ComputerSystem Spec

  5.    03 Nov 2014 #5

    It might also be worth running "sfc/scannow" in command prompt to check for the integrity of the OS files.
      My ComputersSystem Spec

  6.    03 Nov 2014 #6

    I had re-install to get it to work too.
      My ComputerSystem Spec

  7. badrobot's Avatar
    Posts : 5,124
    Win 10 Pro x64
       03 Nov 2014 #7

    I think it's a lot better to make use of your Acronis image backups than playing around with the registry. It's not worth wasting your time trying to fix it at this stage.
      My ComputerSystem Spec


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