BitDefender Antivirus 2011 The software essentially covers you from every lean, protective you from threats on the internet, email, and even instant messaging. The software is even equipped to encrypt your IM chat conversations. The 2011 edition of this antivirus software includes all the capabilities from the already powerful previous version, including the ability to configure (and actually use) a home network. BitDefender is set to perform updates automatically, and run in the background without slowing down your computer.