I just received the same message only for Antivirus 2008. It also takes you to defense-live-scan.com even if you say No to the scan. It's hard to get out of the loop but I finally managed. I too was Googleing in Firefox. I clicked on a search link and whammo - got the message. And no, I was not searching the porn sites or anything else seedy. I'm looking for a pump pressure switch for my well. I had AVG doing a complete scan of my computer and it only found the normal tracking cookies. I don't think my computer is infected but the web site I visited was.