Receive prompt 'You Should Have Administrator"s Authorization'

Maybe someone can help me here...I sort of gotten thrown into setting up the new computers at our business. I have to log in when I first start setting up the computers as the adminstrator. After I add the computer to our domain and DL the software from our server, I then log off. I log back on using the user's name and password. Everything runs fine but I get a prompt stating ''You Should Have Administrator"s Authorization'. I then click OK and the system runs fine. How can I remove the prompt from displaying everytime the user logs on? I don't understand why it is displaying for because they have no access to any administrator functions when logged on...Any help would be appreciated...