I have recently upgraded my dad's o/s to xp home. The modem that was fitted was not compatible with xp so I fitted a spare that was. When i booted up it found it, installed it and everthing seemed ok. Go to connect and the modem does nothing. I have been into the settings and it will communicate with the modem if i "query modem". It has assigned it to com 3,if I look in device manager under com ports it lists 1 & 2 as in use? but does not show 3...............please help!!