Windows 10: Virus & threat protection / Windows Defender update failed

Discus and support Virus & threat protection / Windows Defender update failed in AntiVirus, Firewalls and System Security to solve the problem; My virus & threat protection would not update and stated "Protection definitions are out of date." Check the Windows Update first and try to download... Discussion in 'AntiVirus, Firewalls and System Security' started by ddrmachine, Apr 15, 2021.

  1. DDRMACHINE
    ddrmachine Win User

    Virus & threat protection / Windows Defender update failed


    My virus & threat protection would not update and stated "Protection definitions are out of date."


    Check the Windows Update first and try to download and install all updates first. This did not work for me.




    Virus & threat protection / Windows Defender update failed 1c1ed873-ec04-4e73-ba4f-248bb3db84e8?upload=true.jpg


    Here was my fix that worked for me:

    Complete the Method 1 here:

    FIX: MMC.EXE This app has been blocked for your protection. Solved - wintips.org - Windows Tips & How-tos

    After the reboot setting the UAC back to 1, the Virus & threat protection updated properly and started working again.

    :)
     
    ddrmachine, Apr 15, 2021
    #1
  2. JCH54
    JCH54 Win User

    virus and threat protection

    Virus and threat protection has stopped and will not restart, Windows 10 ver 1709, antimalware client ver 4.12.16299.15 . SuperAntiSpyware installed.

    I have tried most of the suggestions from the support pages, all have been ineffective. Any suggestions

    Moved from: Virus and Malware / Windows Defender / Updating Virus and Spyware Definitions / Windows 10
     
    JCH54, Apr 15, 2021
    #2
  3. MECHTENGINEER
    MechtEngineer Win User
    Cannot turn on Windows Defender virus protection

    I had the same sort of symptoms. In the Windows Security Center, under Virus and threat protection, it said "Your virus & threat protection is managed by your organization."


    Virus & threat protection / Windows Defender update failed wm5Jc.png


    I note you mentioned the Registry Keys under HKLM/SOFTWARE/Microsoft/Windows Defender. Nice spotting, but it seems like there is another key that is causing the problem for some users.

    Steps to a solution:

    1. Press the Windows key and type "regedit"
    2. On the regedit icon that appears, right-click and select Run as Administrator.
    3. Navigate to the folder located at HKLM\SOFTWARE\Policies\Microsoft\Windows Defender (You can paste this into the address box at the top of the window, or navigate manually using the side directory structure)
    4. In this folder, there are probably two keys. Right-click and Delete the DisableAntiSpyware key.
    5. Exit regedit, and return to the Windows Defender settings screen (refresh it if necessary). Windows Defender should have the scan options available and working.

    Solution adapted from here, with a much more detailed solution here.
     
    MechtEngineer, Apr 15, 2021
    #3
  4. IMWHOMIM
    imwhomim Win User

    Virus & threat protection / Windows Defender update failed

    Virus and Threat protection

    NOTICE: After, installing 1909 update, Windows Defender, Virus and Threat protection, is / was "OFF". IS this common? Is this a bug? NO MESSAGE appeared in my Notification Area.. ONLY, by chance, did I notice, and turn it back on. I'd suggest.. AT
    ALL TIMES.. 'WHENEVER' MY virus protection is turned off.. BY DEFAULT... I 'SHOULD' BE NOTIFIED! YOUR thoughts on this?
     
    imwhomim, Apr 15, 2021
    #4
Thema:

Virus & threat protection / Windows Defender update failed

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