- Restart your computer and close any Office-related processes via Task Manager.
- Temporarily disable antivirus or firewall software to prevent blocking of installer components.
- Download a fresh Office installer from your copyright to ensure setup files are clean and complete.
- Run the installer or update executable as administrator by right-clicking and selecting “Run as administrator” to avoid permission issues.
- If you're connected through a VPN or proxy, disconnect it temporarily and retry the installation—network routing can sometimes block required files.
- Use the Microsoft Support and Recovery Assistant to automatically detect and fix Office installation and update errors.
- As a fallback, perform a clean boot of Windows to eliminate interference from other applications, then run the Office setup again.
For a full step-by-step guide with detailed troubleshooting tips, refer to the official walkthrough on fixing Office error code 30174‑45.