When it comes to your audio problem, perhaps installing the latest version of alsa will help.
You can download the latest alsa packages from
http://www.alsa-project.org
The instructions for installing it with nvidia support are there:
http://www.alsa-project.org/main/ind...:Vendor-Nvidia
When it comes to graphics, most distributions have distro-specific ways of installing nvidia drivers,
or you could install the official nvidia driver from their website:
http://www.nvidia.com/object/unix.html