My guess is that the game won't run when anything else is using the microphone. To reproduce the problem:
1. Launch Teamspeak client, and connect to a Teamspeak server of your choice.
2. Attempt to launch Civ IV.
3. Watch it fail to load.
In this case I would expect the game to run fine, with it's microphone support disabled. This would let us use the voice chat software of our choice.
1. Launch Teamspeak client, and connect to a Teamspeak server of your choice.
2. Attempt to launch Civ IV.
3. Watch it fail to load.
In this case I would expect the game to run fine, with it's microphone support disabled. This would let us use the voice chat software of our choice.