I have successfully used a program called Dell Touch to accomplish it. You get the program from Dell and put it on your desktop. Then you add the icon to your start up. Right click Start, select Explore All Users, and drag the Dell Touch icon from your Desktop to this window so that it activates upon start up.

I was able to obtain the Dell Touch program from the Dell website, getting there by using Google search engine by enquiring under the name of the keyboard, Dell Enhanced Performance Keyboard. I went to the home page of Dell on the web, selected downloads, supplied the information about my computer and keyboard, and asked for ALL catagories. Then I found the keyboard on the next screen (down somewhat from the top). I could then follow the directions to download the program, dt201a25.exe, and then I unzipped it and ran it. It shows up as Dell Touch in your program directory.

I have Dell Touch and it still does not work.  Any other ideas? 

Make sure that the sound is not on mute.  What is your sound card?  Turtle Beach Santa Cruz?  Start/ Control Panel/Sounds can get you a chance to test and adjust sound settings.  Everything OK with your sound?  If so, then Dell Touch is the problem.  Do you have it set up as an installed program?  If so, explore it some more in an effort to get it to work.  If you need help, you'll need to accurately describe your computer system, state exactly what is going wrong, and list the steps you have followed trying to fix it and what happened.  That will help forum members understand better and increase your chances of getting a suggested resolution.