Note: Ensure to restart the computer to normal mode (Step 3 in the above link) once the troubleshooting is complete.
Clean boot is performed to disable all startup programs and 3rd party services on the computer and check if they are conflicting with the Office program. If so, you may disable the unwanted software which conflict with the suite or update the same.
You may also try the steps from the link below and check if it helps:
General troubleshooting for installing Office 2013 and Office 365: