Request Permission from TrustedInstaller — What to Do?

While managing files and folders in Windows, you may encounter a message saying: “You need permission from TrustedInstaller to make changes to this file.” This is a system protection feature that prevents accidental deletion or modification of critical files. However, in certain cases, you may still need full access to these files. Let’s explore how to handle this issue effectively.

What Is TrustedInstaller?

TrustedInstaller is a built-in system account in Windows that holds special permissions for critical system files and folders. It is designed to protect these files from changes that could harm the operating system. TrustedInstaller manages access rights and may even restrict access for administrator accounts to ensure system integrity.

How to Access Files Protected by TrustedInstaller

If you are sure you need to modify or delete a file protected by TrustedInstaller, follow these steps:

1. Open the File Properties

  • Locate the file or folder, right-click on it, and select “Properties.”
  • Go to the “Security” tab and click on the “Advanced” button.

2. Change the File Owner

  • In the “Advanced Security Settings” window, click on the “Change” link next to the “Owner” field.
  • Enter your user account name or choose “Administrators.”
  • Click “OK” and close all settings windows.

3. Grant Full Access Permissions

  • Reopen the file properties, go back to the “Security” tab, and click on “Edit.”
  • Select your user account and check the box for “Full Control.”
  • Click “Apply” and then “OK.”

Important Warnings

Modifying access permissions for files protected by TrustedInstaller can cause system instability. Therefore, consider the following:

  • Be cautious: Only change permissions if you are certain about the action.
  • Create a system restore point: Always back up your system before making changes, so you can revert to a previous state if needed.

Restoring TrustedInstaller Permissions

If you need to revert the ownership of a file back to TrustedInstaller, follow the same steps, but in the “Owner” field, enter:

NT SERVICE\TrustedInstaller

This will restore ownership to TrustedInstaller, returning the file to its original state and ensuring system protection.