You experience one of the following symptoms on a Windows XP-based computer:
The Volume icon is not displayed in the notification area at the far right of the taskbar.
When you try to add the volume control icon to the notification area, you receive the following error message:
Windows cannot display the volume control on the taskbar because the Volume Control program has not been installed. To install it use Add/Remove Programs in Control Panel.
Therefore, you cannot start the Volume Control program and cannot adjust the volume and sound level settings of your computer.