In a large bowl or dish, combine sherry, oil, garlic and oregano. Add chicken and turn to coat. Refrigerate 1 hour., Drain chicken, discarding marinade. Heat a Dutch oven over medium-high heat. Add chicken in batches; cook and stir until no longer pink. Remove from pan., In same pan, heat butter over medium-high heat. Add peppers, onion and garlic; cook and stir until tender. Add sherry; bring to a boil. Stir in tomato puree, salt and pepper; return to a boil. Reduce heat; simmer 8-10 minutes or until slightly thickened, stirring occasionally. Add chicken; heat through., Meanwhile, in a stockpot, cook rigatoni according to package directions. In a small saucepan, combine cream and cream cheese over medium heat; cook and stir until blended. Add to chicken mixture; stir in Romano cheese., Drain rigatoni; return to stockpot. Add sauce to pasta; toss to combine.