WinXP network access

We have a LAN with Win98, WinNT, Win2000 OS’es running. Lately, new machines are installed running WinXP Pro. The Local Area Network Properties:
1. Client MicroSoft Networks
2. File and Print Sharing for MicroSoft Networks
3. QoS Packet Scheduler
4. Internet Protocol [TCP/IP]

My problem is that some WinXP Pro machines cannot see/browse, and connect to shared resources from the Workgroups and the computers under them.

The Win98 computers have NetBeui and TCP/IP protocols.

How do I configure my WinXP Pro LAN to be able to see, browse and connect to shared resources.