Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
In a large skillet, cook and stir shrimp and garlic in the butter for about one minute. Pour in half and half; stir. Sprinkle Parmesan cheese in one tablespoon at a time, stirring constantly. After all Parmesan is added, mix in parsley and salt. Stir frequently making sure it does not boil. Sauce will take a while to thicken.
When sauce has thickened, combine with cooked pasta noodles; serve hot.