Steven,
did you read "Appendix F Installing the Creo Applications in Silent Mode" chapter in "Installing Creo 2.0: Creo Parametric, Creo Direct, Creo Layout, and Creo Simulate" guide ?
Follow therse links:
https://support.ptc.com/view?im_dbkey=138510
http://support.ptc.com/WCMS/files/138510/en/creo_2_M120_install.pdf
Martin Hanak