Dell Inspiron 9300 Xp to Windows 7 Audio not working "No Audio OUtput Device is

Hello,
Yesterday, I put in a copy of Windows 7 the complete disk and I got windows 7, but then I've noticed that the audio isn't working. I've looked through every forum and I even looked at the same posts but I try the steps and they don't seem to work. I've been to the Dell website but they only have the drivers for xp and I've tried to look up Vista drivers but I can't find them anywhere. Also, everytime I try find a solution through windows it won't let me update the driver. Please help anyone?