Can't uninstall norton coorporate edition from computer inorder to install a new version on it

My dad and I recently took over this company--The norton coorprate edition on my computer is unable to uninstall without a uninstall password.  The person who installed the program is no longer around.  The progrom is outdated since 2006 and is unable to update or repair.  In order to install a new antivirus, I have to remove the old one according to it.  I tried to us the norton removal tool and it still prompts me with the uninstall password.  What do I do?

 

Richard