Hi akanyr,
Welcome to the HP Forums! I see that you are having problems with your audio. I have done some research and I have a link for you that has a few steps to try. Step 2 mentions installing the latest audio driver and I have the link below for that. Step 4 in the document suggests a different DVD burner and then has a link for their burner. I don't recommend that program one way or the other but there are several DVD burning programs out there.
http://www.aimersoft.com/how-to-burn/windows-dvd-maker-no-sound.html
Conexant High Definition SmartAudio 221 Driver:
Thank you,