Does Windows detect your mic? Can you hear it when you use the listen option? Can other applications detect it? Have you gone into BP's audio settings and change the input device?
YouTube channel: burninrubber0. You'll find road rules and challenges there, along with the occasional full soundtrack of a racing game.
Steam profile: burninrubber0. If you need help with anything Burnout-related, don't hesitate to add me. Be aware that if I don't see Burnout in your Steam library, your friend request will be declined. If you own a non-Steam copy of the game, send me a message on this site before adding me.