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It keeps telling me there's already a version on my computer that is incompatible? I put all the old versions in the trash and flushed it. Maybe that wasn't the right thing to do?
Please see http://openforum.sophos.com/t5/Sophos-Anti-Virus-for-Mac-Home/Removing-Sophos-Anti-Virus-for-Mac-Home-Edition/m-p/1437#M786