w/XP machines accessing shared folders

The problem: All XP client workstations are not able to access shared folders on a Windows 2000 Server, but all 2000 client workstations are able to. Here is the error that we are getting: \\domain\\share name is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Configuration information could not be read from the domain controller, either because the machine is unavaiable, or access has been denied.
All permissions are set correctly I’m clueless of what the problem could be if all other 2000 client machines can view the folders? Please HELP