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I prohibited all types of access (full access, changing, reading writing) to the specified folder for the group "All Users". After that, even Built-In Admin can't access this folder.

Now I can't rollback those permission changes even from the account of Built-In Admin.

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    Are you trying to do this through API calls/programmatically, or just in general? If the latter, it may be better suited for SU.
    – ssube
    Mar 31, 2013 at 7:20
  • I do in general.
    – Engineer Spock
    Mar 31, 2013 at 7:41
  • You should not ask general questions here. Mar 31, 2013 at 9:41

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If you remove ALL permissions to a file or folder you have to take ownership of it before you can do anything to it. Properties | Security | Advanced | Owner | Edit. I recommend that you login as Administrator and set owner to the “Administrators” group. Then you can reset permissions.

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