Windows defender service won't start (build 9860)  

  1. Posts : 11,246
    Windows / Linux : Arch Linux

    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 Windows defender service won't start (build 9860)-security.jpg  
      My Computer

  2. Posts : 983
    Windows 7/64 Professional

    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 Computers

  3. Posts : 7,724
    3-Win-7Prox64 3-Win10Prox64 3-LinuxMint20.2

    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 Computers

  4. Posts : 658
    10 preview 64bit

    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 Computer

  5. Posts : 7,254
    Windows 10 Pro 64-bit

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

  6. Posts : 17,838
    Windows 10

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

  7. Posts : 5,284
    Win 10 Pro x64

    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 Computer


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