cannot view/access server shares

[techie211]

hey ppl, I have a Windows 2003 server with a C: and D: partition. THe D: partition has several shared folders I want my users to access. When I go to the users workstation and do a "\\" at the Run window I only see the shares on the C: partition. If I do a "\\" I get a prompt for a username and password. If I type my username/password I am able to access that share but I am not able to access that shared folder if I type the user's credentials even though that user has full NTFS control over that share..?? any help on this is appreciated