Hi Ross,
Could you please update the steps and options you selected to install this HANA system.
There is one old SAP Note regarding HDB preprocessor not running but that is after the installation while you are getting error during installation.
1611456 - HANA 1.0 bserver "HDB Preprocessor" doesn't start after the installation
You are getting error for SAP Host Agent installation also so would like to check if all the options are correct.
Thanks,
MPS