While many think the new Taskbar feature in Windows 7 is a great improvement, others may not want to use it. The new Windows 7 Taskbar does take some getting used to for sure. However, if you need to get things done on your new OS quickly, you don't have time to learn how it works.
To get the Vista style Taskbar back Right-click an open area on the Taskbar and select 'Properties'. Next, put a check in the checkbox labeled 'Use Small Icons' then select 'Combine when Taskbar is full' from the Taskbar Buttons dropdown menu.