Get your pasta water boiling first. Cooking the shrimp will take the same about of time that it takes for the pasta to cook.
Heat up a large skillet and put in a little olive oil (2-turns around the pan). Once the pan/oil have heated up toss in the 2 cloves of chopped garlic. Add your shrimp to the pan. Again, it cooks quick, just a few minutes on each side.
Once the shrimp is cooked, add the vodka sauce to the shrimp and turn the heat down to a simmer.
Now take care of your pasta, it should be ready. Drain and add to the skillet. Add some fresh parsley and your done