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I was recommended AVG for anti-virus by 4 different sources: a chum who is a computer chappie, the sunday times, the daily telegraph, and a local computer shop. It is free to download and easy to use. However, if you have a problem you need to buy it to get support. However, the pro version is cheaper than Norton or Macafee. I get updates every day. (www.grisoft.com)
ditto Zone Alarm.
They hope you will buy it eventually. (Zone Alarm recommended by the same people)