Well I'll be honest with you. If you wanted to find your audio drivers, formatting was probably not the way to solve it. Granted, your motherboard should have a driver disk that came with the computer with audio drivers on it. But formatting just eliminated any chance that the drivers were already on your computer but just needed to be reinstalled or moved.
Find someone that has the same hardware or something similar and see if they have the drivers. Do some google research about how to find drivers for Intel AC97 audio