The yellow speaker icon can be found in the bottom right hand corner of your taskbar next to your clock. It is there to allow you to adjust your volume controls. However, if you would like to remove it then this is how -
Click Start / Settings / Control Panel then double click the Multimedia tab.
Towards the bottom of the Multimedia window you should look for "Show volume control on the taskbar".
To remove the yellow speaker icon from your taskbar take the tick out of the "Show volume control on the taskbar" checkbox and click Apply then OK.

If at a later date you would like to have the yellow speaker icon back on your taskbar repeat the process for removing the icon but ADD the tick back into the "Show volume control on the taskbar" checkbox and click Apply then OK.
