Shortcut on pc to NT4.0 server gives err

Hi,

I have a user that requires a shortcut on their pc to run a program on the server. When she clicks the shortcut a box pops up asking for username and password. If she uses her logon and password it give an error pertaining to not having theproper rights to use the server. If I enter the NT administrative logon and password the program launches fine. Whats the fix?
thanks