1.    10 Aug 2015 #1

    Update Fails Windows and Defender


    Since yesterday i keep getting this error.

    Any ideas how to fix this?

    Click image for larger version. 

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      My System SpecsSystem Spec


  2. Joined : Oct 2014
    In a house with a crazy cat trying to kill me
    Posts : 11,402
    Win 7 32, Win 7 64 Pro, Win 8.1 64 Pro, Win 10 64 Education Edition
       11 Aug 2015 #2

    See this post for info on the problem.

    Error Codet install - Microsoft Community

    In the past I had Defender not update a couple times. I solved it by d/l ing the definitions manually & installing them. In both instances after doing this, my updates started working again.

    You may also wish to run a SFC to see if anything need repaired.

    https://support.microsoft.com/en-us/kb/923159

    SFC Command - Run in Windows 10

      My System SpecsSystem Spec


  3. Joined : Aug 2015
    Posts : 8
    10
       26 Oct 2016 #3

    FIX: I was able to fix this by opening CMD as Admin and typing (with quotes):


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -RemoveDefinitions -All


    Then I typed (with quotes:


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -SignatureUpdate


    Hope this helped!
      My System SpecsSystem Spec


  4. Joined : Oct 2016
    Posts : 1
    Windows 10 Pro 1607
       26 Oct 2016 #4

    Bingo!


    colsearle said: View Post
    FIX: I was able to fix this by opening CMD as Admin and typing (with quotes):


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -RemoveDefinitions -All


    Then I typed (with quotes:


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -SignatureUpdate


    Hope this helped!
    This worked like a charm. Thank you.
      My System SpecsSystem Spec


  5. Joined : Aug 2015
    Posts : 8
    10
       26 Oct 2016 #5

    I've been chasing that one all day !
      My System SpecsSystem Spec


  6. Joined : Sep 2015
    Posts : 1
    Windows 8.1 Update 3 Enterprise x64 EN
       26 Oct 2016 #6

    colsearle said: View Post
    FIX: I was able to fix this by opening CMD as Admin and typing (with quotes):


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -RemoveDefinitions -All


    Then I typed (with quotes:


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -SignatureUpdate


    Hope this helped!
    Yes. This actually works, thanks a lot.
      My System SpecsSystem Spec


  7. Joined : Aug 2015
    Posts : 17
    Windows 10 x64 Pro
       27 Oct 2016 #7

    Doesn't work!
      My System SpecsSystem Spec


  8. Joined : Aug 2015
    Posts : 7
    Win 10 Pro x64
       27 Oct 2016 #8

    colsearle said: View Post
    FIX: I was able to fix this by opening CMD as Admin and typing (with quotes):


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -RemoveDefinitions -All


    Then I typed (with quotes:


    "%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -SignatureUpdate


    Hope this helped!
    Helped me out
    The update still showed in Windows Update but hitting retry cleared it.
      My System SpecsSystem Spec


  9. Joined : Aug 2015
    Posts : 8
    10
       28 Oct 2016 #9

    I have posted the fix on many Microsoft forums but all have been deleted. Why would they delete the fix ?

    Worrying
      My System SpecsSystem Spec


  10. Joined : Jan 2016
    Posts : 9
    Windows
       28 Oct 2016 #10

    I had this problem on a Win 10 Home based computer. Cannot disable Defender.

    Deleted all files in C:\Windows\SoftwareDistribution\Download, and retried update, but the problem were still there. Clicked on Try Again, and Voila!
      My System SpecsSystem Spec


 


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