Windows Modules Installer (TrustedInstaller) Service Defaults in Windows 8

Enables installation, modification, and removal of Windows updates and optional components. If this service is disabled, install or uninstall of Windows updates might fail for your computer.

Default Settings

Startup type:Manual
Display name:Windows Modules Installer
Service name:TrustedInstaller
Service type:own
Error control:normal
Group:ProfSvc_Group
Object:localSystem
Path:%SystemRoot%\servicing\TrustedInstaller.exe
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TrustedInstaller

Default Behavior

The Windows Modules Installer service is a Win32 program that can be started by the Service Controller and that obeys the service control protocol. In Windows 8 it will not be started until the user starts it. When the Windows Modules Installer service is started, it runs as localSystem in its own process of TrustedInstaller.exe. If Windows Modules Installer fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the TrustedInstaller service hasn't been started.

Restore Default Startup Configuration for Windows Modules Installer

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config TrustedInstaller start= demand

3. Close the command window and restart the computer.

The TrustedInstaller service is using the TrustedInstaller.exe file that is located in the %WinDir%\servicing folder. If the file is corrupted or deleted, you can put it back in there.