First off, I don't claim to be an IT person or know what normal users need to be safe. I can only speak to my personal experience as a programmer. I haven't had a virus in 14 years. I haven't ever run anti-virus software. I have a good feel for all the systems that I use. A little paranoia goes a long way. Not to say that I couldn't be targeted. I'm sure a skilled cracker could break my boxen. But I doubt any antivirus would stop them.