Access to shared user folder

I’m having a problem accessing the some of the shared user folders on my win 2ooo server. For instance I just created a user and tried to set up as a mandatory account, however at the server I open the shared user folder but when I try to open a user folder, I get an error message:
Servername/users/username is not accessible’ Access denied. I notice that I can access any accounts created prior to upgrading to Win2k from NT 4.0 Please Help