I'm using Alienware 14, i updated the audio driver from dell.com but it all messed up with my dolby digital v4. Now dobly digital plus is installed with it which is a lower product as compared to dolby digital v4. Please get this fixed as this is really frustrating! I'm posting link to the audio driver:

http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=DW2CT