This happen regularly on the older Toughbooks. Find an XP or Win2000 modem driver for the 27 or 72 at Panasonic's support site or driverguide.com and it should work just fine. It will allow the machine (XP) to recognize the modem and install the drivers.

The on board will not work with you wireless service becouse the driver were not put into that softwear at that time. but you can use a usb type wireless card and that will work i know i have a cf27 and it workinf fine good luck