"Trying to change the port is not permitted ie XP won't let." this is true of any operating system. A COM port is a COM port and cannot be change to a USB port.
You can view the port and delete it in Device Manager. Right click "My Computer" and select Manage/Device Manager. Double click Ports (COM&LPT) to view the properties of the port/s, here you will also be able to disable the port under Device Usage.