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, 11, 7 and 8.
Startup Type
| Windows Vista edition | without SP | SP1 | SP2 |
|---|---|---|---|
| Starter | Manual | Manual | Manual |
| Home Basic | Manual | Manual | Manual |
| Home Premium | Manual | Manual | Manual |
| Business | Manual | Manual | Manual |
| Ultimate | Manual | Manual | Manual |
Default Properties
| Display name: | Windows Modules Installer |
| Service name: | TrustedInstaller |
| Type: | own |
| Path: | %WinDir%\servicing\TrustedInstaller.exe |
| Error control: | normal |
| Group: | ProfSvc_Group |
| Object: | localSystem |
Default Behavior
The Windows Modules Installer service starts 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.
Dependencies
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.