Windows 10: Suddenly Windows Defender Won't Open

Discus and support Suddenly Windows Defender Won't Open in AntiVirus, Firewalls and System Security to solve the problem; 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... Discussion in 'AntiVirus, Firewalls and System Security' started by Variety1969, May 7, 2017.

  1. VARIETY1969
    Variety1969 Win User

    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

    :)
     
    Variety1969, May 7, 2017
    #1
  2. PA BEAR - MS MVP
    PA Bear - MS MVP Win User
    PA Bear - MS MVP, May 7, 2017
    #2
  3. CDSANTOS
    cdsantos Win User
    Malware

    Windows Defender real time protection won't turn on suddenly...

    Help please
     
    cdsantos, May 7, 2017
    #3
  4. SIMRICK
    simrick Win User

    Suddenly Windows Defender Won't Open

    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[/quote] The result we're looking for is "No integrity violations found".
     
    simrick, May 7, 2017
    #4
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Suddenly Windows Defender Won't Open

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