sasi 0 Newbie Poster

My windows media player was working perfectly. One day, when tried to run a vedio CD, there was no sound.The video part is running alright.Winamp and other software play sound without any problem.I have checked the volume control.The settings are correct.I didn't find any exclamation mark in device manager.
My operating system is win98
I am using AC97 sound card.
I am looking forward for a solution to this problem.