What username and password are you trying to use to log on to the XP machines?
If you are trying to do it anonymously, have you checked to see that anonymous file sharing is actually enabled? There is more than one setting in windows XP that can disable anonymous sharing. You could check very quickly, by creating a new user account on one of the XP machines, (that doesn't exist on the other one) and then try to access you shares... -- To unsubscribe from this list go to the following URL and read the instructions: http://lists.samba.org/mailman/listinfo/samba