1.    14 Aug 2016 #1
    Join Date : Nov 2015
    Posts : 31
    Windows 10 Pro

    Windows 10 Anniversary update Account Unknown and defaultuser0

    Whether you update from Windows 10 or clean install the Anniversary Edition there is a "defaultuser0" account in Users.
    I presume everyone is seeing this. Also when in the Registry, setting permissions (to fix the DCOM errors) there are Account Unknown SID's? I have deleted the defaultuser0 but there are so many Account Unknown SID's in the registry that I have left them.
    I guess the Microsoft engineers stupidly left all these here from orphaned accounts. Can others also confirm they are seeing this?

    Also a couple of links confirms it -
    Windows 10 Anniversary Update is creating profiles
    Windows 10 Anniversary Update: The case of the mysterious account SID causing the flood of DCOM errors
      My System SpecsSystem Spec

  2.    14 Aug 2016 #2
    Join Date : Oct 2013
    East Bay Area, CA
    Posts : 1,033
    Win 10 Pro x64

    Quote Originally Posted by Sayjimwoo View Post
    Can others also confirm they are seeing this?
    Yeah I got one too, clean install I did earlier,
    Attached Thumbnails Attached Thumbnails 2016-08-14_20h06_06.png  
      My System SpecsSystem Spec

  3.    15 Aug 2016 #3
    Join Date : Oct 2013
    A Finnish ex-pat in Germany
    Posts : 8,713
    Windows 10 Pro

    The unnecessary defaultuser() profile folder can be safely removed. On sysprepped systems that has been there since early 10XXX builds, in earlier builds it disappeared by itself after a few reboots but that seems not to be the case anymore, at least not always.

    This screenshot from a video made back in March:

    Click image for larger version. 

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    (Video from Solved Windows 10 instructional videos by Ten Forums members - Page 106 - Windows 10 Forums)

    If it does not disappear simply delete it. Another "ghost profile" that you might see is default.migrated which occasionally appears after a build upgrade. It, too is totally safe to delete.

    I have no knowledge about why these profile folders will be created. I can only speak from my own experience and say that I have done some quite extensive sysprep, deployment and installation tests seeing these folders on almost each test install and have never had any issues manually deleting defaultuser() and default.migrated profile folders.

    Please notice that these two possible "ghost profile" folders should not be confused with the important default user profile folder Default (hidden folder) which should not be touched!

      My System SpecsSystem Spec

  4.    15 Aug 2016 #4
    Join Date : Oct 2013
    East Bay Area, CA
    Posts : 1,033
    Win 10 Pro x64

    Thanks Kari, you're word is good enough for me.
      My System SpecsSystem Spec

  5.    15 Aug 2016 #5
    Join Date : Oct 2013
    A Finnish ex-pat in Germany
    Posts : 8,713
    Windows 10 Pro

    You are welcome Derek
      My System SpecsSystem Spec


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