I got yesterday the 3DS I ordered, but I'm experiencing some issues with the audio.
I can record the video without any problems, but the volume control of the audio isn't available, I can't hear it in my pc and I can't record it.

In the documentation in the CD, I found this piece of information:

So, according to that, the problem is that DirectX isn't installed correctly in my pc, but I've already installed the most recent version from the official site.
I don't get what I'm doing wrong...
Help?