Change the used COM port in  Win98/Me, W2000, WinXP, Windwos Vista

Picture 1: first time, press right mouse button on "My computer" icon and set "Manage"

Picture 2: in device manager we must find the "Ports (COM a LPT)"

Picture 3: in section Ports (COM a LTP) press right mouse button again and click on "Properties"

Picture 4: in this windows please click on "Port Settings" and in the down left click to "Details"

Picture  5: in this windows we must change the port to this one, which havent "used by system"