Download the latest Certified Virus Definition for Norton AntiVirus. Ensure your Norton AntiVirus product contains the most up-to-date detection and prevention. Supports the following versions of Symantec antivirus software:Norton Antivirus 2009 for Windows XP Home/XP Pro/Vista Norton Internet Security 2009 for Windows XP/Home/XP Pro/Vista Norton Antivirus 2008 for Windows XP Home/XP Pro/Vista Norton Internet Security 2008 for Windows XP/Home/XP Pro/Vista Norton 360 version 2.0 for Windows XP/Vista Symantec Endpoint Protection 11.0