I added a 4 port pci serial card to my windows 7 PC. I want to assign them COM1-4.
I know how to change the COM Port Number when the com port number is not already in use.
In my case, COM4 is taken by something... probably some type of usb to serial device I connected at some point. If I knew what it was I could connect it and then change the com port through the Device Manager -> Ports -> dialogs.
But, I have no idea what the device has reserved com4. I'm assuming there is a registry setting or some device descriptor file somewhere that I need to remove. Can anyone point me in the right direction?