To prepare crust, combine crumbs, margarine, and sugar in a mixing bowl. Press mixture firmly in a 9" pie pan. Chill one hour, or until firm. Or, bake in a 350 oven for ten minutes or until lightly browned. Cool on rack before filling. Meanwhile, to prepare filling, combine pie filling, walnuts, brown sugar, and cinnamon. Mix well. Spread mixture into crust; set aside. In another mixing bowl, combine fat-free milk, half and half, and pudding mix. Mix well. Fold in one and half cups whipped topping. Spoon over apple mixture in crust. Spread remaining whipped topping on top. Chill three hours before serving.