No Audio - Dell XPS 400 Problem with "creative" driver?

I have tried everything I can think of to restore lost audio to my Dell XP 400. My sound issues began when I noticed the little round speaker from the bottom bar of my desktop screen had disappeared. When the small speaker icon disappeared so did any and all audio/sound. I can not connect this audio problem with any kind of process applied to my Dell, nothing. Investigating, but not too sure about what to do, I came across a yellow exclamation mark notification next to "Creative SB-X-FI", under sound, video and game controllers. I have tried double-clicking "Creative SB-X-FI," (with the exclamation mark) and selecting "troubleshoot." That got me nowhere, infact for some reason I was not able to get through the troubleshooting steps. I think I need a new driver, and have even tried downloading and installing one, but I have had no success. Help, please!