Jim is buying a new Dell computer and wants to know what antivirus software he should get? Leo says first, an antivirus can't protect him against yourself. It should just be used as a backstop. He will be the first line of defense.
Windows actually has a good antivirus solution built into Windows 8 called Windows Defender. That'll work just fine as long as he keeps it up to date. He should also make sure he runs as a standard user, not an administrator. And don't click on links in emails.