fireman:
Try removing the Mute settings:
1. Click Start > Settings > Control Panel.
2. Double-click the Multimedia applet.
3. In Multimedia Properties, click the Audio tab and make sure "Show volume control on the taskbar" is checked, then click OK.
4. Double-click the volume control on the taskbar.
5. In Volume Control, make sure Playback is checked, then click Options > Properties.
6. In the Properties dialog box under "Show the following volume controls" check all that are listed.
7. Click OK and OK.
8. Back in Volume Control, remove the checkmark from all Mute checkboxes, and adjust the volume slider for each to at least the middle setting.
9. Close Volume Control.
10. Close Control Panel.
11. Restart your computer and test the volume, now.
Regards,
Doc