A Wired article offers a useful summary to avoiding computer viruses. Is it stating the obvious?
“Don’t click on mysterious email attachments, don’t bother with the free pr0n, Ch3@p Vi@gr@, and Nigerian millions, and never open .exe files. Email is still one of the biggest infection vectors, so be cautious and use a good webmail service like Gmail, which automatically scans your messages. Don’t leave your computer online when you’re not on it. Beware of anything that immediately asks for personal information. Don’t reuse passwords.”