Thanks for your help. Due to my cold, I wasn't able to check into things again until last night, but the anti-virus program has now appeared on both of the computers I was concerned about. (When I began investigating, it was on neither; after a complaint, it showed up on one, but not the other, which was what prompted this post.) It seems your explanation was the correct one. Again, my thanks.
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Date: 2012-09-21 05:45 pm (UTC)