Originally Posted by jeaton2012

Try this:
1) Open up System Preferences -> Accounts
2) Create a new, temporary user account with administrator privileges
3) For the current, existing user, uncheck the "Allow user to administer this computer" box
4) Restart & log in as the new administrator
5) System Preferences -> Users & Groups
6) For the real administrator account, re-check the "Allow user to administer this computer" box
7) Log out & log back in as the actual normal user/administrator
8) Delete the temporary administrator account