SOS! No sound after re-installing WIndows XP

Hello,

I had to reinstall windows xp yesterday, and now I have no sound on my computer. I tried using Winamp, and windows media player, but I keep getting no driver detected errors. I have a C-Media CMI8738 audio chip, and I received an error message when I downloaded and tried to install the drivers from the company site. I've checked several different sites, and under the Control panel options, it shows no audio devices detected. Please help!