TrustedInstaller is a built-in user account in all versions of Windows. TrustedInstaller owns a variety of system files including some files in the “Windows” folder and “Program Files” folder. If for any reason, you have changed the ownership of these files or if they are corrupt, it is highly recommended that you restore the ownership back to TrustedInstaller, because it is used by Windows Module Installer Service. By default, the service is set to start manually, which means it only runs when Windows is utilizing the service in installing one of the modules.
The executable is located in C:\Windows\servicing\
The process may consume high CPU Usage but usually, it settles down by itself. This is because, it is installing something that it has permissions for, such operations are normal on Windows. High CPU Usage by this process is not permanent, however, if it doesn’t drop the usage by itself then I’d suggest running an SFC Scan to repair system files.
Restore TrustedInstaller as Owner of a File in Windows
- Right-click the file, folder, drive or the registry key, for which you want to change the ownership. On the Security tab, click Advanced button, near bottom right corner.
- On Owner tab, click the Edit button. You may see a prompt by UAC. Click Continue/Allow/Yes.
- Then click, Other Users and Groups, In the text box, under label Enter the object name to select, type NT SERVICE\TrustedInstaller and click Check Names button. Your typed text will change from NT SERVICE\TrustedInstaller to TrustedInstaller.
- Click OK
If you are changing ownership of a folder that has subfolders, check the checkbox titled Replace owner on subcontainers and objects, Click OK, Click OK again on the Windows Security popup window, Click OK on Advanced Security Settings window, then Click OK on file/folder properties window again. You have successfully restored TrustedInstaller as the owner of the specified item.