How to restore TrustedInstaller ownership to system files

  • Open File Explorer.
  • Browse to the system file you previously changed ownership.
  • Right-click the file, and select Properties.
  • Click on the Security tab.
  • Click the Advanced button.
  • On the “Advanced Security Settings” page, click the Change link on Owner.
  • On the “Select User or Group” page, type the following to add the TrustedInstaller account
    • NT ServiceTrustedInstaller
    • Click OK.
  • Select the following:
    • Replace owner on the subcontainers and objects
    • Replace all child object permission entries with inheritable permission entries from this object
  • Click Apply.
  • Click OK again to complete the task.

Finally, if you granted yourself full control to the system file, you may also want to remove these settings as well, and to do that you can use the following steps:

  • Right-click the system file, and select Properties.
  • Click on the Security tab.
  • Click the Advanced button.
  • On the “Advanced Security Settings” page select your account.
  • Click Remove.
  • Click Apply.
  • Click OK to complete the task.

Source: http://www.windowscentral.com/how-restore-trustedinstaller-owner-system-files-windows-10

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