Hi WilliamR25,
Welcome to the HPCommunity, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I will be happy to help with your issues installing the IDT High Definition Audio driver. I did some research into your problem and found two HP threads with potential solutions.
The first one has a link to a different Windows 8.1 driver. Give that a try first.
The second thread has a couple of different steps to try including using generic Windows drivers.
Give those two thread a try and let me know how it goes.
Thank you,