MaxxAudio is a needed program.  Also sounds like you either uninstalled programs you need when you got the PC or have tried to do a clean install and items missing?  
Dear community, I've been using company's Lenovo Think Pad Edge laptop for ten years, and it worked like charm with my AV receiver, reproducing 5.1 sound via HDMI effortlessly, regardless of running on battery or mains. However, time has come for a new one, and now I have Dell Inspiron 3593 (NOT15370). My idea is of course to use as previous one, but I noticed that nothing happened when I connected my laptop with receiver yesterday, i.e. TV screen was blank, and no signal on receiver's display. Now, I read in FAQ that laptop shall be on mains, to begin with. However, I wonder do I need the driver for the Realtek High Definition audio codec (Version 6.0.9018.1, A03) to install beforehand as well as Waves-MaxxAudio-Pro-Application M85FF WIN64 2.0.54.0 A03 06? Please advise. Thanks in advance.
Connecting Dell Inspiron 3593 (NOT15370) to Onkyo TX-SR576 AV 5.1 receiver