How to Fix Trustedinstaller.exe High CPU Usage


Many Windows Vista users have ever faced or been facing an issue -  trustedinstaller.exe occupies much CPU resources and stalling Windows.


This article will explain what this process is, what it does, and how to resolve the issue of high CPU usage by this process.


TrustedInstaller is used by a service called “Windows Module Installer” in Vista system. It is used for installing Windows vista system modules which include automatic Windows Update that scans your system for available updates and hotfixes. So when scheduled Windows Update is performing a scan on your system to check for updates, the TrustedInstaller.exe process will appear in task manager and  increases the CPU usage.


Although this process is causing high CPU usage and a slow computer, it is safe and essential for windows system to update itself and run properly.


However, sometimes if you have urgent work to be done, and there is no time to wait for Windows Update to complete, you may want terminate the process and run it another time. In such case, you have two ways to stop the process trustedInstaller.exe:


Method 1 – Turn off Automatic Windows Update

  • Open Control Panel from Start Button
  • Click System and Maintenance.
  • Click Turn automatic update on or off.
  • Select this option: Never check for updates
  • Click OK.

Method 2 – Disable Windows Installer Module from service list

  • Open Control Panel from Start Button
  • Click Administrative Tools.
  • In the right pane of the corresponding window, double-click Services.
  • Locate and double-click Windows Module Installer.
  • Click the General tab.
  • Select Manual from the Startup Type drop down menu.
  • Click Apply.
  • Click OK.


After this, you shall not get trustedinstaller.exe high CPU issue anymore. If you still receive this error, it is suggested that you use a system optimizer to scan your system and fix errors. Virus and malware can corrupt the registry and cause numerous problems in your computer, including the trustedinstaller errors. Remember, 90% of the computer problems are caused by registry issues. So it is always recommended that you install a system optimizer to consistantly protect your system.