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  1.    15 Feb 2016 #1
    Join Date : Feb 2016
    Posts : 8
    Windows 10

    Issues after taking ownership of C:\


    Hi there. I've been rather stupid and transferred ownership of C:\, including system32, to my account (the administrator and only user). While I would instantly switch it back, due to an unrelated reason I restarted my computer (Surface Pro 4). Since then I've done research and found that it was definitely not a good idea to transfer ownership to begin with.

    When I turn the computer on, it boots up normally until the point where it (presumably) leads to the login screen, but remains with the spinning-dots loading symbol. After some experimentation it still responds to the keyboard shortcut to change brightness. Also, upon CTRL+ALT+DELETE it goes to the normal screen except without any text. The buttons for wifi, ease of access, and sleep/shutdown/restart on the bottom-right are present and do work. When I hold down the power button the normal 'slide to shutdown' screen appears and is functional.

    Is there any solution? Since I can't log in or access File Explorer (or Command Prompt) I can't reset permissions.

    Many thanks for any help at all.
      My ComputerSystem Spec
  2.    15 Feb 2016 #2
    Join Date : Oct 2013
    NW Florida
    Posts : 9,693
    Windows 10 Pro and Windows 10 Pro Insider

    I don't know if it can do what you need, but you can get access to the command prompt from installation media Command Prompt at Boot - Open in Windows 10 - Windows 10 Forums
      My ComputersSystem Spec
  3.    15 Feb 2016 #3
    Join Date : Feb 2016
    Posts : 8
    Windows 10
    Thread Starter

    Quote Originally Posted by essenbe View Post
    I don't know if it can do what you need, but you can get access to the command prompt from installation media Command Prompt at Boot - Open in Windows 10 - Windows 10 Forums
    Thanks for the response. After doing some more digging I've found a way to access that, and am currently looking through other places to find the right command (I'm only familiar with Unix).
      My ComputerSystem Spec
  4.    15 Feb 2016 #4
    Join Date : Nov 2015
    Posts : 299
    Win-10 Pro x64

    Just a thought, but what about creating a Bootable PE Rescue Disk?

    To be honest, I just discovered this myself, but it looked like it might offer some help.


    b1rd
      My ComputerSystem Spec
  5.    15 Feb 2016 #5
    Join Date : Feb 2016
    Posts : 8
    Windows 10
    Thread Starter

    Quote Originally Posted by b1rd View Post
    Just a thought, but what about creating a Bootable PE Rescue Disk?
    If this is what I think it is, then it's sadly not really possible. When I tried to make a bootable USB (since I don't have any essential personal files), it became apparent that you need another Windows machine to set it up. This is another problem, because I am surrounded by Macs. I don't have access to any other Windows computers very easily at all.

    In response to my previous post, I've been trying to change permissions for System32, C:\Windows, and now the entirety of C:\ to TrustedInstaller (the default) through command line. Although it says that it's successful, each time I subsequently restart it doesn't work. I'll try a few more variations thereof, regardless.

    Thanks once again.
      My ComputerSystem Spec
  6.    15 Feb 2016 #6
    Join Date : Oct 2013
    NW Florida
    Posts : 9,693
    Windows 10 Pro and Windows 10 Pro Insider

    What command did you use to take ownership?
      My ComputersSystem Spec
  7.    15 Feb 2016 #7
    Join Date : Feb 2016
    Posts : 8
    Windows 10
    Thread Starter

    Quote Originally Posted by essenbe View Post
    What command did you use to take ownership?
    Code:
    icacls C:\ /setowner "NT SERVICE\TrustedInstaller" /T /C
    I used
    Code:
    takeown /F C:\Windows /A
    beforehand when trying to do it just for the Windows folder, as suggested by another forum.

    EDIT:
    My attempt to use the first command has finished and hasn't worked.
      My ComputerSystem Spec
  8.    15 Feb 2016 #8
    Join Date : Oct 2013
    NW Florida
    Posts : 9,693
    Windows 10 Pro and Windows 10 Pro Insider

    I should have a good answer for you in a little while, but I'm not sure you can undo it.
      My ComputersSystem Spec
  9.    15 Feb 2016 #9
    Join Date : Feb 2016
    Posts : 8
    Windows 10
    Thread Starter

    I see. Thank you regardless, especially for your speedy response. If it's impossible then I'll just reset the machine and make sure I learn from this mistake.
      My ComputerSystem Spec
  10.    15 Feb 2016 #10
    Join Date : Oct 2013
    NW Florida
    Posts : 9,693
    Windows 10 Pro and Windows 10 Pro Insider

    Your best chance would probably be to try a system restore to a point before you took ownership. Hopefully you have restore points to that time. System Restore Windows 10
      My ComputersSystem Spec

 
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