Dunno man. I use the realtek for sound and my old SB audigy card for mic input and it works. All drivers were up to date so I didn't change them.
I get it that you want to play it, but to be honest, from this beta you will not get much more than from watching videos on utube about the game. I played it for a few days, did a few quests and put it down until the game is released. It's still buggy and the devs don't care about the beta anymore as they only focus on finishing the final game.
Maybe try getting a steam key, there is a tread for that (Fussili gave me one, you just need to ask), who knows, it could be a launcher issue.