Windows 10: Suddenly Windows Defender Won't Open

  1.    08 May 2017 #1

    Suddenly Windows Defender Won't Open


    Hi there:

    For some reason, when I tried to use Windows Defender today I get the following message:

    "This application is turned off by group policy. To allow this application to run, contact your security administrator to enable the program via group policy"

    WTF? I haven't done anything or changed anything. All I did was turn on my PC.

    I tried to open group policy via run gpedit.msc but it says file is not file is found....

    Please help!!!! Lynn
      My ComputerSystem Spec

  2.    08 May 2017 #2

    Variety1969 said: View Post
    Hi there:

    For some reason, when I tried to use Windows Defender today I get the following message:

    "This application is turned off by group policy. To allow this application to run, contact your security administrator to enable the program via group policy"

    WTF? I haven't done anything or changed anything. All I did was turn on my PC.

    I tried to open group policy via run gpedit.msc but it says file is not file is found....

    Please help!!!! Lynn
    Hi Lynn and welcome to Tenforums.
    If you have Windows 10 HOME, Group Policy Editor is not available to you (only W10 Pro).

    Do you have another AV running on the system? If so, many times that will turn Windows Defender off, so they don't conflict.

    If no other AV, try booting into safe mode and see if you can run it there.
    Boot into Safe Mode on Windows 10 - Windows 10 Performance Maintenance Tutorials

    If so, set it to run an offline scan.
    Windows Defender Offline Scan in Windows 10 - Windows 10 Security System Tutorials

    If not, please try downloading and running ADWCleaner.
    Downloads - AdwCleaner - ToolsLib

    If it finds anything, please post the logs, found in C:\AdwCleaner\AdwCleaner[S1].txt and C:\AdwCleaner\AdwCleaner[C1].txt

    If ADWCleaner finds nothing, open an admin Command Prompt or admin PowerShell and enter:

    Code:
    sfc /scannow
    The result we're looking for is "No integrity violations found".
      My ComputerSystem Spec


 

Related Threads
Windows Defender fails to Open - error in AntiVirus, Firewalls and System Security
I need your help please. Windows defender doesn't want to open and I have no virus/spam software running. I think the problem was caused by some new malware. When I click the defender icon on desktop or cpanel: Windows cannot access the...
Unable to open Windows Defender in AntiVirus, Firewalls and System Security
While I was away someone tried to make changes to my system. I am trying to enable Defender, but I receive the attached message;110858 I am the administrator.
Solved After the anniversary update: Windows Defender is suddenly visible in AntiVirus, Firewalls and System Security
After the Anniversary Update Windows Defender inserts itself into the context menu and also adds its icon to the Notification Area. This is despite the fact that Windows Defender is turned off on my machine. Also, Settings -> Personalize...
cannot open windows defender in AntiVirus, Firewalls and System Security
72473 I am using Lenovo g40-45. whenever I click 'open windows defender', the message on the picture attached flashes. real time protection is on. your help is highly appreciated! thank you!
Solved Windows Defender will not open in AntiVirus, Firewalls and System Security
After doing the second upgrade for Windows 10 on one of my machines, when clicking on Windows 10, it says it cannot open. Everything else is working fine. How to fix this? there is no other antivirus program on this computer and it worked fine...
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 08:12.
Find Us