Do you mean Task Bar or Quick Launch Bar?
If the latter, left click on and drag the separator between it and the Task Bar to the right until you have a blank bit (i.e. with no Icons on it). Right click on the blank part of the Quick Launch Bar, select View and then select Small Icons.
The whole Bar area may now be too high. Bring your mouse cursor down until it touches the top and the cursor changes to an up/down arrow. Depress left mouse button and drag top down to where you want it.