DHCP and DNS woes

Greetings, I must have missed something here; I have configured 180 ip's available via DHCP and created 180 DNS records. Like this: station10 IN A 192.168.2.10 station11 IN A 192.168.2.11 station12 IN A 192.168.2.12 So when I boot a station it will be asigned an ip-address by dhcp and receive a host name from DNS, But this is only working on the Linux machines. Could someone please tell me why the windows PC's don't get a host name update at all? BIG THANKS Chadley