No access to win95 clients from win2000

We have a Win 2000 Server and a few Win 2000 Clients running on a small network. Also on this network are a couple of Win95 Clients.
The problem is the Win95 Clients can see and access everything but none of the Win2000 Clients or server can accessthe Win95 machines. You get this message:

//computername is not accessible
The account is not authorized to log in from this station.

I can ping the Win95 machines from any other machine by name or address. I have also installed the DSClient from the Win2000 Server CD-ROM. I’ve tried all I can think of.
Somebody please help.
Thanks. TheTravman…………………