I have a Compaq Scanner Keyboard and PageScan software V3.5.3 which recognizes COM ports 1, 2 and 3. COM 1 is my serial Mouse, COM 2 is an internal modem. COM 3 can't be used because of conflicts with the mouse. I have an available external COM 4 port available, but the software won't recognize COM 4. Is there a way to get the scanner to operate off of COM 4?