If your looking for audio drivers as your title suggests then you need to go to the Dell support web page and enter in your service tag number and it will gring uo your laptop and all that is in it. It will also list the drivers that are needed for those parts and you can download any that you may need.
You will have to go into the control panel and under sounds look for the settings that you need to enable for sound to be played for different things like movies and audio cd's.You may have Windows media player set as the default audio and you may want to change that.