How to Make Trusted Installer Owner of Trusted Installer Again

If you've taken ownership of a protected file, folder, or registry key, you should change it back to the default TrustedInstaller owner after making changes.

TrustedInstaller is a built-in user account in all versions of Windows that owns various system files, including some files in the Windows and Program Files folders. TrustedInstaller is also the owner of the Windows.old folder, which is created when you update to a newer version of Windows and allows you to roll back to the previous version.

The TrustedInstaller user account is used by the Windows Modules Installer service, so TrustedInstaller has exclusive permission to install, modify, and remove Windows updates and other optional Windows components.

When you change the ownership of a protected registry key or take ownership of a file or folder, you should change the owner back to TrustedInstaller after making your changes.

Access the Advanced Security Settings for a File or Folder

If you're restoring TrustedInstaller as the owner of a file or folder, right-click on the file or folder and select Properties.

Select Properties for a folder in Windows

Access the Advanced Security Settings for a Registry Key

If you're restoring TrustedInstaller as the owner of a registry key, first open the Registry Editor.

Note: The Registry Editor is a powerful tool that can render your system unstable or even inoperable if misused. This is a fairly simple change, and if you follow our instructions, you shouldn't have any problems. But make sure you back up the Registry, create a Restore Point, or back up your computer before making changes.

Press Windows key + R to open the Run dialog box. Then, type: regedit and hit Enter or click OK.

If the User Account Control dialog box displays, click Yes to continue. You may not see this dialog box, depending on your User Account Control settings.

Open the Registry Editor using the Run dialog box in Windows

Navigate to the registry key you want to restore ownership back to TrustedInstaller for. You can enter the path to the key in the box just under the menu bar, and press Enter to get to the key quickly.

Right-click on the key and select Permissions.

Right-click a registry key and select Permissions in the Windows Registry Editor

Restore TrustedInstaller as the Owner of a File, Folder, or Registry Key

If you're changing the owner of a file or folder, the Properties dialog box displays. If you're changing the owner of a registry key, the Permissions dialog box displays. But they're both similar.

On the Security tab or either dialog box, click Advanced.

Click Advanced on the Properties dialog box in the Windows Registry Editor

On the Advanced Security Settings dialog box, click the Change link to the right of Owner.

Click Change for the Owner on the Advanced Security Settings dialog box in the Windows Registry Editor

In the Enter the object name to select box on the Select User or Group dialog box, type: NT SERVICE\TrustedInstallerand then click Check Names.

Enter user name and click Check Names for a Windows registry key

NT SERVICE\TrustedInstaller changes to the official TrustedInstaller username.

Click OK to accept the change and close the Select User or Group dialog box.

Close the Select User or Group dialog box in the Windows Registry Editor

The Owner changes to TrustedInstaller on the Advanced Security Settings dialog box.

Close the Advanced Security Settings dialog box in the Windows Registry Editor

If you're changing the owner back to TrustedInstaller for a folder that has subfolders or a protected registry key that has subkeys, you can make sure the owner changes to TrustedInstaller for all the subfolders or subkeys.

To do this, check the "Replace owner on subcontainers and objects" box on the Advanced Security Settings dialog box.

Then, click OK.

Check the Replace owner on subcontainers and objects box on the Advanced Security Settings dialog box in the Windows Registry Editor

Click OK on the Properties or Permissions dialog box.

Close the Properties dialog box in Windows

Be Very Careful When Modifying System Files or Protected Registry Keys

The TrustedInstaller user account owns your system files and folders and protected registry keys for a reason. If you rename or edit any of these items, Windows will stop functioning, and you'll likely have to repair it or even reinstall it.

You should only take ownership of system files and folders and protected registry keys and rename, delete, or move them if you know what you're doing. Also, be sure to change the owner back to TrustedInstaller after making your changes.

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Source: https://www.groovypost.com/howto/restore-owner-file-folder-registry-key-trustedinstaller-windows/

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