There is a little speaker icon that lives in the lower-right of your screen right next to the clock. This icon enables you to adjust the Volume on your computer by clicking on it. If you want to remove this icon:
Click on "Start", point to "Settings" and click on "Control Panel".
Double click to open the "Multimedia" or "Sounds & Multimedia" window.
Click to remove the check mark from "Show Volume Control on the Taskbar".
If you want to put the speaker back, just follow the directions and click to put a check mark back in the box.