I nid a driver for my multimedia audio ctrler

Hello,
I have the same problem...I installed a new OS (windows sever pack 2). I realized that there was no volume control at the toolbar. When I try to play a sound file, There was no sound coming up with my headset. It says that "no audio device detected". Then, When I run the Add New Hardware Wizard, It says that "The drivers for this device are not installed. (Code 28)". What should I do? Where can I get a driver for my mulitimedia contoller? someone pls. help me...