Pinging 192.168.80.1 from the windows machine:
Destination is unreachable
This machine was a linuxmce computer. It had no problem getting a ip address from the core and working properly.
This means it has no routeability to the core's internal IP address, which given that the core is on the same subnet probably means that the XP machine doesn't have an IP address at all, hence no ability to route and so it drops the packets because the destination is unreachable.
This would happen because either:
1) It isn't set to DHCP and still has a static IP that isn't valid for that subnet (ie isn't 192.169.80.x)
2) It isn't successfully receiving a DHCP lease
3) The NIC port is disabled