Well I went a little backwards. I wanted a computer with a built in serial port for updating autopilots after having trouble with USB to Serial cables. Bought a older Tough book that has XP on it for updating Autopilots. Anyways how worried should I be about security with the Windows XP? Not going to be used much except for in the field updating equipment and downloading new firmware. The little bit I have used it I really like the old XP operating system too bad they had to stop supporting it.