- Restart your computer and ensure no Office-related processes are running in Task Manager.
- Run the installer or update as an administrator by right-clicking and selecting “Run as administrator” to ensure proper permissions.
- Temporarily disable antivirus, firewall, or any third-party security software, as they may block necessary installation components.
- Use the Microsoft Support and Recovery Assistant to automatically identify and fix installation or update issues.
- Perform a clean boot of Windows to minimize background interference from other applications or services.
- Repair the Office installation from Control Panel by going to Programs & Features, selecting Microsoft Office, clicking Change, and then choosing Repair.
- Ensure required services like Background Intelligent Transfer Service (BITS) and Windows Installer are running in the Services panel.
For complete instructions and additional troubleshooting methods, refer to the official solution guide for Office error code 0x80080005.