Windows Update 80072EFE error

October 2016


I have a problem with Windows Update, I can not install the updates .. I've ran Windows Update and click on the install updates button and 5 seconds after it shows me this message:

Some updates were not installed.  
Failed: 6 critical updates.  
Errors found: Code 80072EFE Windows Update has encountered an unknown error.  

Furthermore, I have no access to Windows Update site anymore and I can't make a system backup.


  • Go to:Start, Control Panel, administrative tools, services, double-click on the Cryptographic service, click stop the service, apply and OK.
  • Also verify that the Intelligent Transfer Service is stopped and is set in manual mode.
  • Then go to C\windows, rename SoftwareDistribution using the (.old extension), like this:
    • SoftwareDistribution.old
  • Then go to: C\windows\system32\Catroot2, removes all content in Catroot2, (not the file himself)

Go back in Services, restart the Cryptographic service (set in automatic mode),
  • Download:, put it in your Documents and unzip it. Double-click the executable, it will try to re-register all the files necessary for the proper operation of Windows Update,
  • Subsequently restart you PC and return to windows update....

Thanks to ekim55 for this tip on CCM.

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