The taskbar? Do you mean what I think you mean? The one with the start button?
By default, it is always at the bottom of the screen. Maybe your screen
resolution is higher than it should be. If it is loaded and you see it
somewhere other than the bottom of the screen, just drag it to the bottom of
the screen. Also, the image might not be aligned correctly. You should use
the buttons on your monitor to adjust it, but the exact procedure to do this
depends on your monitor.
Anyway, if that is not the case, have you tried restarting your computer? If
there is a long start up procedure, maybe it isn't loading. To tell if it's
running, press Ctrl+Alt+Delete to get the task manager, click on the
"Processes" tab, and check if "explorer.exe" is listed.