Windows 8 Services

Windows Modules Installer - Windows 8 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 Vista.

Startup Type

Windows 8 edition Windows 8 Windows 8.1 Windows 8.1 Update 1
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Pro Manual Manual Manual
Enterprise Manual Manual Manual

Default Properties

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

Default Behavior

The Windows Modules Installer service runs as localSystem 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 logged. Windows 8 startup proceeds, but a message box is displayed informing you that the TrustedInstaller service has failed to start.

Restore Default Startup Type of Windows Modules Installer

Automated Restore

1. Select your Windows 8 release and edition, and then click on the Download button below.

2. Save the RestoreWindowsModulesInstallerWindows8.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.

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 8 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.