the virus might have come from a popup, I get those quite alot. make sure you're using firefox.also, the problem might be with your virus scanner. most scanners have lazy programmers, and only search for simple segments of code that viruses often have, but other programs might have as well. the scanner will then label that program a virus. if your scanner supports it, just do a scan of the advance map folder(both the folder and the zip file to be sure) and see if the virus is in there.