Windows defender handled by another av program

I think it need to have actually been mounted an on by default. You can check the system occasion log as soon as you think the concern started or attempt reinstalling it.

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Regards, Dave Patrick ....Microsoft Certified ProfessionalMicrosoft MVP Datacenter ManagementDisclaimer: This posting is provided "AS IS" through no warranties or guarantees, and also confers no civil liberties.

Tuesday, December 20, 2016 11:46 PM


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Hi Thinkislnds,

Have you tried the steps discussed in the attach to install?

If installed, you might open Windows Defender management consingle to connumber the settings.

Best Regards,


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Thursday, December 22, 2016 2:18 AM


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We had actually the same problem and I had the ability to solve this this the complying with way.


Windows Defender was disabled in Unattended.xml, however was mounted as component of our setup procedure.


Windows Defender thinks there is another AV installed, also though no AV has ever before touched the System.


The solution for the majority of servers was easy: Just run:

Remove-WindowsFeature Windows-Defender

Install-WindowsFeature Windows-Defender,Windows-Defender-Gui

And reboot.

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If you allowed On Demand Scanning when on the server the difficulty was that you couldn"t disable On Demand Scanning anymore in the settings, and also Defender was stuck in "Handled by an additional AV Program" even if you unmounted, set up Windows-Defender. It took as quit some time to troubleshoot this because the regisattempt vital is not recorded all over, but it can be solved as follows:

Take Ownership of the Registry Folder HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows DefenderGive Administrators Full Control PermissionDelete the “PassiveMode” Registry Key underHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows DefenderRemove Full Control Permission from AdministratorsGive Ownership earlier to System

This solved the difficulty for us on all servers. Hope this helps.