Windows Vista Services

Windows Modules Installer - Windows Vista Service

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.

This service also exists in Windows 10, 7 and 8.

Startup Type

Windows Vista edition without SP SP1 SP2
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Default Properties

Display name:Windows Modules Installer
Service name:TrustedInstaller
Error control:normal

Default Behavior

The Windows Modules Installer service as localSystem and runs in its own process of TrustedInstaller.exe. It does not share its process with other services. If Windows Modules Installer fails to start, the error is recorded into the Event Log. Windows Vista startup proceeds, but a message box is displayed informing you that the TrustedInstaller service has failed to start.


Windows Modules Installer will not start, if the Plug and Play service is stopped or disabled.

Restore Default Startup Type of Windows Modules Installer

Automated Restore

1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.

2. Save the RestoreWindowsModulesInstallerWindowsVista.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the TrustedInstaller.exe file exists in the %WinDir%\servicing folder. If this file is missing you can try to restore it from your Windows Vista installation media.

Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me.