Keep your Norton Anti-Virus updated.

Supports the following versions of Symantec antivirus software:

Norton AntiVirus 2000 for Windows 9x/NT/2000
Norton AntiVirus 2001 for Windows 95b/98/NT/2000/Me
Norton AntiVirus 2002 Professional Edition
Norton AntiVirus 2002 for Windows 98/Me/NT/2000/XP Home/XP Pro
Norton AntiVirus 2003 Professional Edition
Norton AntiVirus 2003 for Windows 98/Me/2000/XP Home/XP Pro
Norton AntiVirus 2004 Professional Edition
Norton AntiVirus 2004 for Windows 98/Me/2000/XP Home/XP Pro
Norton AntiVirus 2005 for Windows 98/Me/2000/XP Home/XP Pro
Norton AntiVirus 7.x Corporate Edition Client
Norton AntiVirus for Microsoft Exchange (Intel)
Norton SystemWorks (all versions)
Norton Utilities for Windows 95/98 (all versions)
Symantec AntiVirus 3.0 for CacheFlow Security Gateway
Symantec AntiVirus 3.0 for Inktomi Traffic Edge
Symantec AntiVirus 3.0 for NetApp Filer/NetCache
Symantec AntiVirus 3.1 for SMTP Gateways for Windows
Symantec AntiVirus 8.0 Corporate Edition Client
Symantec AntiVirus 8.1 Corporate Edition Client
Symantec AntiVirus 9.0 Corporate Edition Client
Symantec AntiVirus/Filtering 3.02 for Microsoft Exchange 2000
Symantec AntiVirus/Filtering 3.1 for Domino
pcAnywhere32 7.5 and higher for Windows NT

Norton AntiVirus defends your PC against detected viruses, spyware, bots, worms, and more while minimising the performance impact or getting in your way. The improved Norton Protection System features multi-layered protection technologies that work together to proactively block attacks and detect and remove threats before they can harm your PC.

Intrusion Protection defends your PC from web-based attacks so you can surf with confidence. And new Vulnerability Protection blocks security holes in your PC’s operating system, applications, browsers, and browser plug-ins to prevent hackers from exploiting them.