Fill a large pot with lightly salted water and bring to a rolling boil. Once the water is boiling, stir in the fettuccini, and return to a boil. Cook the pasta uncovered, stirring occasionally, until the pasta has cooked through, but is still firm to the bite, about 8 minutes. Drain well in a colander set in the sink.
Heat the olive oil in a skillet, and cook the chicken breast halves over medium heat until lightly browned, about 5 minutes per side. Pour the Italian dressing and balsamic vinegar over the chicken, add the mushrooms, and cook, covered, until the chicken is no longer pink inside. Remove the chicken breasts, and cut into strips.
Stir the tomatoes, cream cheese, and basil together in the skillet with the mushrooms over medium-low heat until the mixture comes to a boil. Stir to melt the cream cheese into the sauce, add the chicken strips and the cooked fettuccini, and toss together. Sprinkle with Parmesan cheese to serve.
