network connection

I AM HAVING A NETWORK OF TEN MACHINES 8 OF THEM ARE ON W2K PRO AND A SERVER RUNNING REDHAT LINUX
AND ONE RUNNING WIN XP HOME EDITION. IN MY NETWORK FROM ANY MACHINE IN THE WORKGROUP I CAN BE ABLE TO SEE ALL THE MACHINE FROM ANY MACHINE BUT I AM UNABLE TO ACCESS ANY MACHINE FROM THE WIN XP MACHINE OR ACCESSING THE XP MACHINE FROM THE W2K PRO MACHINE. PLEASE HELP ME OUT