My first experience with Sophos antivirus.
I've also taken Sophos for a spin around the block, installing it several days ago. I did two scans, including the "look in every compressed folder" scan (not for the faint of heart - took about 8 hours).
It didn't find anything.
I've been using ClamXav and, when I first installed it, it found two or three things (I can't recall what they were) which it put into the Quarantine folder and I threw them out. I suppose that's why Sophos didn't find anything.
I've left them both installed and they don't seem to care, although periodically they switch places on the menu bar.
I'm going back to just ClamXav.
ryck