Hi,
If you have many Quick Launch icons showing, more the glider over to cover
all but three. If this isn't the case, see if this applies:
This can happen by opening Accessibility Options, etc. If the icons on the
Quick Launch bar are showing as being larger, it will result in the taskbar
being twice its height and also include the date or similar under the clock.
If this is the case, right click the Desktop/Properties/Appearance/
Advanced. Under the Item drop box choose Caption Buttons and change the
number by one, ok your way out, then rest to 25.
And/or reset your default to the XP Theme.
More options and workarounds via this small app:
Repair/Customize Quick Launch, Taskbar and Notification Area
http://www.kellys-korner-xp.com/taskbarplus!.htm
Good luck!