Personally, I wouldn't touch Norton or Mc Afee with a barge pole. They tend to slow down the system or at least they did. Used to use AVG (free) until they changed to version 8 I think. Which was rubbish.....so I changed to Comodo (also free). I've never had any problems....
Interested in the Microsoft version, will check it out. Didn't know it existed....thanks Carl