Workgroup can't access 2003 share

i'm sure this is a simple one:
i've 2 stations 1 running XP pro and the other XP home, in a workgroup. they can see/share files no problem.
I've just added a 2003 sever to the workgroup with a share. both stations can see the server but can't access the share (user authentication error)

Any thoughts??

 

forgot to say that the server is running service pack 1 and both stations have all the latest service packs/patch's

 

The work stations will need a user name and password the same as an account on the server with admin privliges.

 

thanks for that, i'll give it a try when i'm next in that office