I am not able to hear audio - ( Mercury Tv Tuner Card ) but i can view the video,

I have re-install the Tv Tuner driver
{ TV Capture Card WDM Tv Tuner &
TV Capture Card WDM Video Captuer }, Window Audio Driver ( Avance AC'97 Audio )
still i am not able to hear audio.

I had install 3 part software [ ChrisTV, Nero Media Home ] still no good.

Help is need!