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  1.    10 Aug 2015 #1
    Join Date : Jun 2015
    Posts : 56
    Win 10

    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 ComputerSystem Spec
  2.    11 Aug 2015 #2
    Join Date : Oct 2014
    In a house with a crazy cat trying to kill me
    Posts : 16,242
    Win 7 32, Win 7 64 Pro, Win 8.1 64 Pro, Win 10 64 Education Edition

    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

    https://www.tenforums.com/tutorials/2...dows-10-a.html

      My ComputerSystem Spec
  3.    26 Oct 2016 #3
    Join Date : Aug 2015
    Posts : 8
    10

    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 ComputerSystem Spec
  4.    26 Oct 2016 #4
    Join Date : Oct 2016
    Posts : 1
    Windows 10 Pro 1607

    Bingo!


    Quote Originally Posted by colsearle 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 ComputerSystem Spec
  5.    26 Oct 2016 #5
    Join Date : Aug 2015
    Posts : 8
    10

    I've been chasing that one all day !
      My ComputerSystem Spec
  6.    26 Oct 2016 #6
    Join Date : Sep 2015
    Posts : 2
    Windows 8.1 Enterprise x64 EN

    Quote Originally Posted by colsearle 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 ComputerSystem Spec
  7.    27 Oct 2016 #7
    Join Date : Aug 2015
    Posts : 50
    Windows 10 x64 Pro

    Doesn't work!
      My ComputerSystem Spec
  8.    27 Oct 2016 #8
    Join Date : Aug 2015
    Posts : 8
    Win 10 Pro x64

    Quote Originally Posted by colsearle 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 ComputerSystem Spec
  9.    28 Oct 2016 #9
    Join Date : Aug 2015
    Posts : 8
    10

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

    Worrying
      My ComputerSystem Spec
  10.    28 Oct 2016 #10
    Join Date : Jan 2016
    Posts : 9
    Windows

    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 ComputerSystem Spec

 
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