In a usual machine comm1 + comm2 are enabled in the bios. So this will give you virtual ports comm3 + comm4, usually used for the modem. If IRQ's are at a premium then comm 2 can be disabled.
What may be happening is that comm2 is not enabled in the bios. If only comm1 is active then your virtual port will be comm2.
You can check if comm2 is enabled. If it is not then you must remove the modem from device manager, restart and enter the bios. Adjust the setting and save. Reboot and put the drivers for the modem back on and then see if it has selected comm3 or comm4 for it.
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