How to Turn On or Off Microsoft Defender Antivirus in Windows 10  

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  1. Posts : 68,667
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #50

    biorpg said:
    Is this content automatically generated?
    Hello biorpg, and welcome to Ten Forums. :)

    There's nothing that needs to be generated since this will only toggle Windows Defender on or off.
      My Computers


  2. Posts : 1
    Windows 10
       #51

    ViTosS said:
    Hello, nice tutorial you made, but when I try to navigate to Windows Defender in Local Group Policy, there is nothing there, look this printscreen I took if you can:

    Attachment 31254

    How do I proceed now? Should I use the registry? By the way my Windows is Windows 10 Pro 64bits and is activated.
    The german translation doesn't have the "Windows-Defender"-entry either. But I found it. In the german translation it's under "Endpoint Protection".

    How to Turn On or Off Microsoft Defender Antivirus in Windows 10-tfhjpry.png

    Hope this could help other languages aswell.

    Otherwise try to find it like this, that's how I did it:

    Select "All Settings" at the bottom on the left -> How to Turn On or Off Microsoft Defender Antivirus in Windows 10-x9jhsnf.png

    And then look for something like "Deactivate" in your language and look for the Path to the right
    How to Turn On or Off Microsoft Defender Antivirus in Windows 10-dxjzyjg.png
      My Computer


  3. Posts : 19
    Windows 10
       #52

    Thank u for this guide... The stupid update, Windows 10 Pro, version 1511, 10586 reactivated Defender even though I already had an alternative AV installed. Smh
      My Computer


  4. Posts : 68,667
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #53

    I'm glad it could help urbanman. :)
      My Computers


  5. Posts : 2
    Windows 10
       #54

    defender definition updates fail


    Hi Brink. I got a link to this forum from a thread I created on the Microsoft answers site. Not sure if this fix will address the issue of Defender definition updates failing to install and generating an error message whenever Windows Update downloads the latest defs. Here is an example of the message:


    "Definition Update for Windows Defender - KB2267602 (Definition 1.213.2537.0) - Error 0x80070643"


    I have contacted MS 3 times and others have done the same or suggested fixes that they thought might work to no avail. The problem boils down to MS policy in Win 10 to download all updates whether you want them or not. Since I am using Norton Internet Security Defender is turned off but MS insists on downloading the updates and the design is so poor that the updates fail if Defender is off. I have suggested 3 options to MS but all they do is hide the failed update temporarily only to have the next one fail again. As a former programmer it seems to me there are 3 options to stop these error messages:

    1- don't try and install definition updates when Defender is off.2- allow the files to be installed even if Defender is off. This would not only not hurt anything but would keep the definitions current so if I ever do decide to switch to Defender I will have the most current definitions available. (seems like the best option to me)
    3-if Defender is off just squelch the error message as it is NOT REALLY AN ERROR IT IS DESIGNED TO DO THAT?

    My question to you is I don't have a problem with Defender being on or off I have a problem that since it is off I get error messages whenever Update runs. Is this going to stop the error messages or will it just ensure that Defender is off and because of the piss poor design of Update continue to have the definition files fail to install and error messages to be generated? Thanks.
      My Computer


  6. Posts : 15,441
    Windows10
       #55

    jawinters said:
    Hi Brink. I got a link to this forum from a thread I created on the Microsoft answers site. Not sure if this fix will address the issue of Defender definition updates failing to install and generating an error message whenever Windows Update downloads the latest defs. Here is an example of the message:


    "Definition Update for Windows Defender - KB2267602 (Definition 1.213.2537.0) - Error 0x80070643"


    I have contacted MS 3 times and others have done the same or suggested fixes that they thought might work to no avail. The problem boils down to MS policy in Win 10 to download all updates whether you want them or not. Since I am using Norton Internet Security Defender is turned off but MS insists on downloading the updates and the design is so poor that the updates fail if Defender is off. I have suggested 3 options to MS but all they do is hide the failed update temporarily only to have the next one fail again. As a former programmer it seems to me there are 3 options to stop these error messages:

    1- don't try and install definition updates when Defender is off.2- allow the files to be installed even if Defender is off. This would not only not hurt anything but would keep the definitions current so if I ever do decide to switch to Defender I will have the most current definitions available. (seems like the best option to me)
    3-if Defender is off just squelch the error message as it is NOT REALLY AN ERROR IT IS DESIGNED TO DO THAT?

    My question to you is I don't have a problem with Defender being on or off I have a problem that since it is off I get error messages whenever Update runs. Is this going to stop the error messages or will it just ensure that Defender is off and because of the piss poor design of Update continue to have the definition files fail to install and error messages to be generated? Thanks.
    Something is not right here. I use Norton 360 on 3 pcs, and Defender is switched off, and I do not get any Defender updates.
      My Computer


  7. Posts : 68,667
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #56

    Hello jawinters, and welcome to Ten Forums. :)

    You might see if uninstalling Norton Internet Security completely, manually turn off Windows Defender using this tutorial, then reinstalling Norton Internet Security may toggle things to work properly again and not get anymore WD definition updates.

    Here's a link to the Norton Removal Tool to help make sure it's completely uninstalled.

    https://support.norton.com/sp/en/us/...rProfile_en_us
      My Computers


  8. Posts : 2
    Windows 10
       #57

    thanks


    Brink
    Just uninstalling Norton and reinstalling it did not work however on the MS forum a user posted a link that he said he got from you-

    https://www.tenforums.com/tutorials/5...dows-10-a.html

    which I downloaded and ran while I had Norton off. Once the .reg file was merged into my registry I reinstalled Norton and so far I have not gotten any Defender updates. I know this is a relatively short time but it is about 20 hours which should be long enough to have had MS issue a definition updates so I believe my problem has been resolved. Thank you for your help.
      My Computer


  9. Posts : 68,667
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #58

    Great news jawinters. Yeah, you would have gotten a definition update by now after 20 hours if it was going to.
      My Computers


  10. Posts : 90
    Windows 10 Pro 64bit
       #59

    a guide how to free the space taken by Defender on the drive would be very useful.
    my "C:\ProgramData\Microsoft\Windows Defender" folder is almost 800MB, such a waste in my opinion.
      My Computer


 

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