If you have windows XP go to control panel, go to administrative tools, go to services, scroll down to windows audio,double click on it, it will open properties. If windows audio is stopped, click on start or restart. Also check to make sure it's start type is automatic. If it isn't change it to automatic. Sometimes if you get a virus in your machine it will turn the windows audio off. You may have to download a free Microsoft Safety Scanner to check your computer.
Jack, June 2011