How to connect windows98 system to windows server 2003

Dear Group members,

I have recently installed Windows server 2003 on my IBM
Server as Stand alone server. I have 10 Client PC's, some
of them run on WinXP and some of them run on Win98. After
doing Networking, I found only XP systems are able to
access the 2003 Server, Where as WIn98 Systems unable to
browse the 2003Server. When I try to double click on the
Server in Network, it asks password for the username $IPC.
Which is unknown.

Please give instructions how to come out of this problem.

Thanks and regards
Giridhar