Windows 10: Can not turn on Windows Defender..

  1.    28 Apr 2017 #1

    Can not turn on Windows Defender..

    Hi Gang,

    I am on Windows 10 Home version. this is a 2 week old install of Windows 10.. I am all uipto date with my drivers besides my Video card drivers..

    I installed Kaspersky AV and then I uninstalled it with Control Panel add remove. I am know unable to turn on Windows Defender..

    I tried using Kasperskys removal tool which said it removed some but I still can not turn on Windows Defender..

    When I go there with Settings/Update and Security all the options are Greyed out.. I tried contacting Kaspersky help line but they are blaming it on a Microsoft issue as usual so no help there..

    I am unsure what else to try I googled a few things but none of it worked.. So I hope the experts here can help me as I have no where else to turn too..
      My ComputerSystem Spec

  2. Bree's Avatar
    Posts : 8,636
    10 Home x64 (1803) (10 Pro on 2nd pc)
       28 Apr 2017 #2

    Kaspersky may have set the registry setting that disables Defender and it has not been removed yet. See Option Two in this tutorial...
    Turn On or Off Windows Defender in Windows 10
      My ComputersSystem Spec

  3. Posts : 562
    Win 10 Pro, 18219 (Skip) 64bit
       28 Apr 2017 #3

    - Check your registry and manually remove possible Kaspersky leftover keys (Windows key + R) regedit

    - Try System Restore
      My ComputerSystem Spec

  4.    28 Apr 2017 #4

    Bree those seemed to be on in the registry..

    torre there is only 2 and they are too recent to go back on a restore point so that is not an option.. I did not see any Kaspersky entries in registry either..

    What is really annoying is Windows keeps telling me they are off but trying to turn them on has no effect..
      My ComputerSystem Spec

  5. Posts : 562
    Win 10 Pro, 18219 (Skip) 64bit
       28 Apr 2017 #5

    Random ideas:

    - Check with Bree about your findings


    Run Revo and do a forced uinstall to try to find Kaspersky leftover entries

    - Reinstall Kaspersky and uninstall using only the Kaspersky Removal Tool.

    - At last resort, Reset Win10
      My ComputerSystem Spec

  6.    28 Apr 2017 #6

    this sucks as I may have to reset windows now Arghhhh!!
      My ComputerSystem Spec

  7. TairikuOkami's Avatar
    Posts : 3,334
    10.6 Home 1809 x64
       29 Apr 2017 #7

    Download this and run it as admin, Windows will restart afterwards.
    Can not turn on Windows Defender.. Attached Files
      My ComputerSystem Spec

  8. Bree's Avatar
    Posts : 8,636
    10 Home x64 (1803) (10 Pro on 2nd pc)
       29 Apr 2017 #8

    JLAF5150 said: View Post
    this sucks as I may have to reset windows now Arghhhh!!
    Try an in-place repair install instead, you keep all your installed apps and files that way...

    Repair Install Windows 10 with an In-place Upgrade
      My ComputersSystem Spec

  9.    02 May 2017 #9

    Maybe even sfc /scannow?
      My ComputerSystem Spec


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