If your computer is having problems playing sound, try using the Playing Audio troubleshooter to fix the problem. It checks for common problems with your volume settings, your sound card or driver, and your speakers or headphones.
To open the Playing Audio troubleshooter:
Click the Start button, and then click ControlPanel.
In the search box, type troubleshooter, and then click Troubleshooting.
Under Hardware and Sound, click Troubleshoot audio playback.