You don't mention which operating system you have, which would be useful to know, to say the least!
These may help. They are results from a google search for "taskbar hidden"
http://petermartinconsult.supanet.com/computer/windows/taskbar.htm
http://ask-leo.com/the_task_bar_on_my_windows_xp_machine_has_become_hidden_how_do_i_get_it_back.html
me
December 2009
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