There are better freebies out there than Norton or Macafee. These progs are a waste of money and want to take over everything and even try to stop you from doing stuff that is harmless. I have used for years AVG and never had any probs. Here is a link to a free download.
http://free.avg.com/us-en/download-avg-anti-virus-free
If you insist on paying for protection then ESET is IMO preferable to NORTON OR Mcafee.