The only thing I can say is if windows loads a driver for sound and if it is working I would just leave it alone. windows 8 & 8.1 are a crap. I would say more than half the people here that are having problems are running windows 8.
If you run windows 7 and don't have the problem. Then it isn't the board it is a windows 8 problem sorry. I'm sorry if I can't come with a solution to your problem, but windows 8 is the real problem.
One other thing is if everything is working with the drivers installed. Other than those folders opening slow you might have to live with it. If that is the only problem you are having feel lucky that is it with windows 8.