Make sure the audio card is enabled in the BOIS... Do you know how to do this?
(Assuming you have the right driver vvv Could be Dell's fault too)
Are you installing the driver from the Dell provided Installation PROGRAM?... Or manually loading it from the Device Manager?... Do you know how to do this?
If that doesn't work try to download this lightweight driver tool Unknown Devices v 1.2 by halfdone.
http://www.halfdone.com/Development/UnknownDevices/extract the download to a folder and delete the pcidevs.txt file (List of Hardware). Below the download button on halfdones page there is a link to a brand new pcidevs.txt file on "Craig's website" download the newest list and put it in your unknown devices extracted folder. Run the Unknown Devices app and find your audio device listed in the app. Compare the specs listed on Unknow Devices with the specs on Dell's Support site to verfy that you are using the correct Driver.
Let me know
