Cook the pasta according to the package directions. Meanwhile, in a large skillet, cook the beef over medium heat until it's no longer pink, breaking it into crumbles with a spoon as you go. Drain the grease. Stir in the taco seasoning and let the ground beef cool.
When the pasta is done, drain it and rinse it with cold water to cool it down. Stir the pasta into the seasoned ground beef. Add the lettuce, tomatoes, cheese, onion, green pepper and dressing. Toss the pasta salad well to coat everything in the dressing. Serve the taco pasta salad with tortilla chips.
