How to allow Domain User to use one of 2 Terminal Service "Licences"

Hello:

How can I let one user of our domain enter onto a Windows 2000 machine and access applications, etc. I gave him Admin. priveleges, etc but no luck. When he logs on via Terminal onto the workstation, it allows him in, but then does not recognize his user as valid when accessing certain "private" shared resources, it asks him for a user and password. When he uses a generic password, it lets him in. This is the only glitch. I would like him to enter into the domain and then work that way. What am I missing or doing wrong?

thanks,

joseph