2003 server/XP pro networking

Hello. I have a small workgroup with 9 XP pro machines and one 2003 server. The problem I’m having is that one computer (station 9) is only able to see one other computer on the network (station 7). I can ping all the others, and I can reach station 9 from all the others, but from station 9 I cannot browse to the other computers, and the search feature on XP does not find any computer except for 7. Any suggestions?

Thanks.