In the box, type your Windows (or "Administrators" for group access) and click Check Names . Click OK .

In Windows, "Administrator" does not mean "Owner of everything." To prevent malware or accidental user error from crippling the operating system, Microsoft assigns ownership of critical system files (like those in C:\Windows or C:\Program Files ) to TrustedInstaller. FPPThttps://www.free-power-point-templates.com Delete Files Protected by TrustedInstaller in Windows 10

(full name: NT SERVICE\TrustedInstaller ) is a built-in Windows security principal (service account) with highest-level permissions over critical system files, folders, and registry keys. It’s part of Windows Resource Protection (WRP) and supersedes even the built-in Administrator account for protected OS components.

TrustedInstaller permissions represent a critical security boundary in Windows architecture. By segregating the ability to modify system files from the Administrator account, Microsoft creates a defense-in-depth layer that protects the operating system from both user error and malware escalation. Modifying these permissions should be considered a high-risk operation reserved for extreme troubleshooting scenarios.