Hello again t716,
Thank you for the feedback on your issue. So this is a fun one by the sounds of it. We have everything working, but the sound and if we put the driver back in we get the sound but loose the webcam. I am going to approach this from a different angle, rather than working on the drivers lets see if rolling the system back will work.
I would like you to follow the steps in the HP Support document: Using Microsoft System Restore (Windows 8) (works the exact same for Windows 8.1) which will walk you through rolling the drivers back to a point in time where your audio and webcam both worked at the same time. This will not affect your personal files, but any applications installed or setting changed since the point you chose will have to be either re-installed or re-changed.
Please re-post with an update on this step. Thank you for posting on the HP Forums. Have a great day!