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  1.    08 Dec 2016 #100
    Join Date : Oct 2016
    Posts : 9
    MocOS Sierra

    I made the registry change on two machines (build 14986) and Windows Defender still will not turn on, saying that another program (Bitdefender?) is handling it. But I uninstalled Bitdefender using Revo Uninstaller pro, so it is NOT there anymore. How do I get WD to start? Is there a registry key that tells WD that there is another product doing the AV?
      My ComputerSystem Spec
  2.    08 Dec 2016 #101
    Join Date : Oct 2013
    Posts : 24,317
    64-bit Windows 10 Pro build 17017
    Thread Starter

    Hello Jarome,

    It sounds like Bitdefender may not have been completely uninstalled. You might see if this below may help.

    Uninstall Bitdefender
      My ComputersSystem Spec
  3.    08 Dec 2016 #102
    Join Date : Oct 2016
    Posts : 9
    MocOS Sierra

    I have tried all the suggestions, but to no avail. I had Bitdefender installed, but removed it using Revo Uninstaller Pro. And have rebooted many times. In build 14986, Windows Defender turns on for about 10 seconds, but then turns off, saying that antivirus is handled by another product.Click image for larger version. 

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ID:	112829
    This happens on 3 different machines!
      My ComputerSystem Spec
  4.    08 Dec 2016 #103
    Join Date : Jul 2015
    Posts : 251
    windows 10 pro 64

    hi
    thanks a lot for the tutorial
    but how i know if it's enabled outside the system tray icon?
    i have not the icon , and the service seems and the service is set to manual
      My ComputerSystem Spec
  5.    08 Dec 2016 #104
    Join Date : Oct 2013
    Posts : 24,317
    64-bit Windows 10 Pro build 17017
    Thread Starter

    Hello drugo,

    You could open Windows Defender to see.
      My ComputersSystem Spec
  6.    08 Dec 2016 #105
    Join Date : Oct 2013
    Posts : 24,317
    64-bit Windows 10 Pro build 17017
    Thread Starter

    Jarome,

    Did you already try what I posted above for uninstalling Bitdefender?
      My ComputersSystem Spec
  7.    23 Dec 2016 #106
    Join Date : Dec 2016
    Posts : 1
    Windows 10

    Thnx alot for this post......I tried many things to on my windows defender but nothing worked.Thnx to you my wndows defender is working again...Thnk u so much...........( :
      My ComputerSystem Spec
  8.    23 Dec 2016 #107
    Join Date : Oct 2013
    Posts : 24,317
    64-bit Windows 10 Pro build 17017
    Thread Starter

    I'm glad it could help Sthitaprajna, and welcome to Ten Forums.
      My ComputersSystem Spec
  9.    15 Apr 2017 #108
    Join Date : Apr 2017
    Posts : 3
    W10

    If you are updating to Windows 10 Creator edition ensure that you re-enable defender complete the update then disable again. The Defender environment is a little more complete with this update.
      My ComputerSystem Spec
  10.    16 Apr 2017 #109
    Join Date : Apr 2017
    Posts : 3
    W10

    I have just updated to W10 Creator release and found that if you have disabled Defender via this method you will need to reenable so that the update completes successfully and then re-disable Defender if that is your preference via the same method.
      My ComputerSystem Spec

 
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