1.    31 Oct 2016 #1
    Join Date : Jun 2016
    Los Angeles
    Posts : 1,200
    Windows 10 Pro

    KB2267602 (Definition 1.231.870.0) - Windows Update Error 0x80070643

    When Windows Defender Real Time Protection is Enabled, and I go to Windows Update it tries to update the definitions, gets to 66% and it stalls and then I get this error message KB2267602 (Definition 1.231.870.0) - Error 0x80070643.
    If I disable Real-Time Protection in Windows Defender, then check for Windows Updates, it says Your Device is Up to date?
    What I have tried: I manually updated the Windows Defender Definitions in the app. I downloaded the latest definitions from Microsoft web page: Get the latest definitions - Microsoft Malware Protection Center. I deleted all the files in C:\Windows\SoftwareDistribution\Download. I ran SFC /scannow.
    I ran DISM /Online /CLEANUP-IMAGE /Check Health. There were no violations.
    Computer works well and II still get other updates, but this keeps failing? got me perplexed.
      My ComputerSystem Spec
  2.    31 Oct 2016 #2
    Join Date : Oct 2014
    Posts : 500
    Windows 10 Pro 16299.192

    I ran into this problem last week and spent the better part of the day trying to find a fix. The fix for me was found here:
    I ran the two commands in the post above after I ran sfc /scannow. I hope this helps you. It seems this has been an on-going issue with Windows Defender and the fix seems to vary from user to user. Strange that this has started to appear again in the past few weeks.
      My ComputerSystem Spec
  3.    31 Oct 2016 #3
    Join Date : Jun 2016
    Los Angeles
    Posts : 1,200
    Windows 10 Pro
    Thread Starter

    This worked for me. Thanks!
      My ComputerSystem Spec


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