Improved performance delivers faster scans
Network mapping provides a view of your home network.
Detects and removes spyware and viruses
Blocks spyware and worms automatically
Protects email and instant messaging from viruses
Prevents virus-infected emails from spreading
Rootkit detection finds and removes hidden threats
Remove dangerous threats from files you download
Block spyware from hijacking your computer
Stop spyware from tracking you online
Block Internet worms at point of entry

Version 2007 (14.0)
After many years of customer complaints regarding the speed and system resource utilization of the product, Symantec responded in 2007 with a much needed rewrite of the code in an attempt to make the product lighter and faster.[2] Installer size in Norton AntiVirus 2007 was reduced by utilizing 7-Zip technology[citation needed].

Norton AntiVirus 2007 automatically detects and blocks viruses, spyware, rootkits and worms. Several of its key features are Rootkit Protection which finds and removes hidden threats in the operating system, Internet Worm Protection that blocks viruses, spyware and worms without specific signatures, email and instant message scanning that detects, removes or blocks infected attachments and Full System Scan which performs a deep scan to remove existing viruses, spyware and other threats. Norton Protection Center provides a central place to easily check overall security settings. Its Live Update™ Notice alerts you to new features, product updates and threat advisories as available throughout the renewable service period.

Version 2008 (15.0)
Norton AntiVirus 2008 was released on August 28, 2007. It includes new features such as SONAR (Symantec Online Network for Advanced Response) technology, which detects potentially malicious code before traditional virus definitions are available. SONAR works by monitoring programs behavior rather than looking for signatures. Norton AntiVirus 2008 also includes Browser Defender, which protects Internet Explorer from drive by downloads and unpatched exploits. Norton AntiVirus 2008 also includes One-Click Support, Home Network Security Status (displays status of Norton AntiVirus on all PC's in your network), and improved performance (about 60% faster than Norton AntiVirus 2007

Norton AntiVirus Final description
Blocks certain more sophisticated worms (such as Blaster and Sasser) before they enter your computer
Norton AntiVirus was designed to remove viruses, worms, and Trojan horses automatically - without interrupting your work.

New Norton Internet Worm Protection blocks certain more sophisticated worms (such as Blaster and Sasser) before they enter your computer. Norton AntiVirus can also detect spyware and other non-virus threats.
Here are some key features of "Norton AntiVirus Final":

Norton Internet Worm Protection stops certain damaging Internet worms at their attempted point of entry.
QuickScan tool automatically searches for and removes viruses whenever new virus protection updates are downloaded.
PreInstall Scan quickly detects and removes infections that can interfere with installing and launching Norton AntiVirus.
Automatically removes viruses , worms, and Trojan horses.
Scans and cleans both incoming and outgoing email messages.
Blocks viruses in instant message attachments.
Detects spyware and certain non-virus threats such as adware and keystroke logging programs.
Scans compressed file archives before you open them and risk infecting your computer.
Downloads new virus protection updates automatically to protect against new threats.
Worm Blocking and Script Blocking can detect new threats even before virus protection updates are created for them.
Improved performance delivers faster scans
One click access to expert support
Works quietly in the background.
Network mapping provides a view of your home network.
Detects and removes spyware and viruses
Blocks spyware and worms automatically
Protects email and instant messaging from viruses
Prevents virus-infected emails from spreading
Rootkit detection finds and removes hidden threats
Includes protection updates and new product features as available throughout the renewable service period
Remove dangerous threats from files you download
Block spyware from hijacking your computer
Stop spyware from tracking you online
Block Internet worms at point of entry
Remove viruses from email and instant messages

Key TechnologiesAntispyware
Antivirus
Internet Worm Protection
Rootkit Detection

Requirements:

300MHz or higher processor
256MB of RAM
300MB of available hard disk space