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My modem came preconfigured to use COM2, but I have the COM2 serial port built into my PC and they are conflicting
Explanation: You have installed an internal modem, which is trying to use the COM2 serial port. However, the PC itself has a built-in COM2 port and this is conflicting with the internal modem.
Diagnosis: This is a very common problem, because most motherboards today come with the COM2 port on the motherboard enabled, and most modems come preconfigured to use COM2. This may be a throwback to the days before it was common to have two COM ports in active use; I'm not sure.