Hi . I have a Sony Vaio laptop, It was working just fine but when I turn on the computer again it was already on mute. so I tried to un-mute it and it didn't un-mute . And When I turn the volume up it only goes up by one and wouldn't go up farther but still, it's mute
so I went on sound mixer and it said "no audio device is installed"
can you please help me ??
Try reinstalling the Audio Drivers. You will have to reinstall the UAA High Definition Audio Class Driver first as XP does not support HD Audio. If you cannot find this in the Drivers Package, then download it from here: -
Another possible solution is to go to your device manager, select the audio card with the red X and delete it. Restart you machine and Windows should detect new hardware. You can now, if necessary the new driver according to the make and model