I'm just guessing here, but it sounds like you may be referring to the
Taskbar, the one with the Start button. If so, click and hold on a blank area
of the Taskbar and drag it down to the bottom of your screen where it return
to the horizontal position. Hopes this help.

Do you mean the Task Bar? The bar that's normally at the bottom of the
screen, with "Start" at the left and the clock at the right?

Although by default the task bar appears on the bottom of the screen,
it can be on any of the sides you prefer it on. To move it from any
side to another, simply click on an unused part of it and drag it
where you want it. Be sure to click *within* it, not on the edge;
clicking on the edge and dragging will resize it.

If it won't move, it may be locked. In that case, right click on it
and uncheck "Lock the taskbar," then try again.

--
Ken Blake, Microsoft MVP Windows - Shell/User
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