Norton AV. Forget McAffee or other online virus checkers. These days, fully protecting your system from the possible avenues of infection is the only way to avoid them (or use another system exclusively for internet, no networking to other machines). I receive about a dozen emails with W32 virus every week. Luckily they are automatically Bayesianed out by a spam filter. Keep it enabled all the time except when not connected to the internet or installing. BYS