With crockpot on high, boil chicken until done. Shred chicken and add to crockpot with 1/2 the bottle of Italian Dressing. Boil pasta for 5-6 minutes...Do not cook completely. While pasta is boiling, add remaining ingredients EXCEPT cream cheese. Add pasta and turn crockpot to LOW and simmer 4-6 hours. Add cream cheese 1/2 hour before serving and blend completely. Garnish with cheese and sour cream.