I agree that there is only minimal risk for the 770 to be infected by viruses.

The risk of "malware" attacking the Opera browser is far worse. When I tried a few of the tests which are available at http://www.heise.de/security/dienste/browsercheck I found some vulnerabilites of the 770's Opera browser. For instance phishing with frames (frame spoofing) to name only one.

Maybe we should install a CERT forum for the 770