My brother just purchased a Windows 8 laptop. It has the native Windows Defender on it, but it also has a trial of Norton. Is there any reason he should keep Norton? I keep seeing the new Defender (not the same as the earlier version) touted as the replacement for Security Essentials. However, I never really see Defender being referred to as "antivirus" specifically, but rather as "antimalware". Is this just semantics, or does it lack something essential that Norton has? We would love to ditch Norton since Defender is free.