At ny home network behind Linksys router, I have 4 Windows XP Pro machines. All can do printer/file sharing using IP address. All except a laptop can do the same using NetBIOS name too. The laptop also fails to ping any other machine using their NetBIOS names but can ping them using their IP addresses. The laptop was brought to home by my son from his school and we changed its workgroup to match the other machines at home. Its network settings are auto i.e. use DHCP to get TCP/IP and DNS parameters. Tried using wired NIC in place of wireless but still the same problem. The only difference in the ipconfig/all output is that the other three machines show "Node Type" as "Unknown", the laptop shows it as "Peer-Peer". How can I make this laptop to resolve host names within my workgroup?