2000 server with XP Pro

Was running 2000 Server using Win 98 clients in a workgroup. Changed clients to XP Pro. Ran network setup using same workgroup name but when I try to view workgroup computers I get a message “workgroup is not accessable. You may not have permission to use this network resource. “Is there a permission policy I need to set on the XP client or on the 200 Server? What am I missing?