No Audio Detected after Re installing Windows XP

One of my office laptop which is running windows XP and model Toshiba Satellite L510. Previously I was configured windows vista on this laptop. User is not familiar to use vista so I install Windows XP.
After installed Windows XP I installed all driver that I collect from internet. Everything is ok; previously it works slow but now works fast. But now sound device does not work properly. The device manager shows sound card installed properly but sound can’t work. can you please help me to guide me?
