Windows 10: Unable to start Windows Defender,

Discus and support Unable to start Windows Defender, in AntiVirus, Firewalls and System Security to solve the problem; running Windows 10 on a stand alone PC, infected since running a possible malware. Have been using licensed McAfee and Kaspersky AV programs as an... Discussion in 'AntiVirus, Firewalls and System Security' started by 29AshishAgarwal, Oct 24, 2018.

  1. Unable to start Windows Defender,


    running Windows 10 on a stand alone PC, infected since running a possible malware. Have been using licensed McAfee and Kaspersky AV programs as an alternate. Windows Defender does not run even on the offline scan option


    Unable to start Windows Defender, f0468d23-705f-4ea2-afb7-f59595a28403?upload=true.png

    :)
     
    29AshishAgarwal, Oct 24, 2018
    #1
  2. davidhk Win User

    Windows Defender disabled and is unable to start


    OK. I am not sure if you can complete the steps below.......................
    In the search box, type services.msc > Enter
    Items in the Services box are listed alphabetically.
    Scroll down to Windows Defender Service...........................
    at Status heading, it should be.................................... Running
    at Startup type, it should be......................................... Automatic


    Unable to start Windows Defender, [​IMG]




    If that is not what yours said, right click at Windows Defender Service > click Properties >
    can you change the Startup type to Automatic and Service status to Start ?
    If yes, do so and click OK when done.
     
    davidhk, Oct 24, 2018
    #2
  3. Windows Defender disabled and is unable to start


    Hi guys!

    I finally managed to fix my Windows Defender. I had to restore the service using registry key. And also make changes in the registry using steps mentioned on articles online.

    I restored the WD default registry key through the steps provided here this restored my service of Windows defender.

    Services - Restore Default Services in Windows 8

    It seems that the registry key for WD of Windows 8.1 is same as that of Windows 10.

    I also followed the steps mentioned here:
    [FIX] Windows Could Not Start The Windows Defender Network Inspection Service On Local Computer

    And

    Here:

    Windows Defender Does Not Start in Windows 10 - WindowsInstructed

    So far it's working fine. Will report back if I see anything weird pop up as I did fiddle with the registry keys.

    Thanks for the help davidhk Unable to start Windows Defender, :)
     
    thenextstar, Oct 24, 2018
    #3
  4. gzt7d8 Win User

    Unable to start Windows Defender,

    Unable to Re-Start Windows Defender Services


    A little background first, I downloaded a file and started to install it when Defender caught the virus, but didn't contain it. So I downloaded Malwarebytes to scan and remove the virus.

    After I loaded Malwarebytes I noticed I wasn't getting anymore Windows Defender definitions but I noticed the Windows Defender services were stopped and I figured Malwarebytes stopped it and that was the reason I wasn't getting anymore updates on Defender.

    I uninstalled Malwarebytes but now I can't restart Windows Defender.

    If I got to Control Panel then Security and Maintenance window. Both buttons to turn on Defender are grayed out.


    Unable to start Windows Defender, [​IMG]


    If I search for Windows Defender in the search window on the task bar. This is the result I get.


    Unable to start Windows Defender, [​IMG]


    And lastly, if I go into Task Manager Services, there are 2 entries for Windows Defender, both are stopped. If I try to restart them this is the message I get.


    Unable to start Windows Defender, [​IMG]


    So is there anything I can do to restart the app or does it require more drastic steps such as reload 9926?
     
    gzt7d8, Oct 24, 2018
    #4
Thema:

Unable to start Windows Defender,

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