Anti-virus, firewall and Internet security software

• AVG Anti-virus – free; anti-virus
• Microsoft Security Essentials – Free anti-virus and anti-spyware from Microsoft. Supercedes Windows Defender (see below). Also, Security Essentials definitions
• Microsoft Windows Defender – Free anti-spyware from Microsoft. Best designated for Windows XP sp3 machines. Included in Windows Vista and Windows 7, and not compatible with Windows 2000. Also, Windows Defender definitions
• Norton Internet Security – non-free; anti-virus, firewall, spam/phishing protection, parental control
• Sophos Anti-Virus – shareware; anti-virus. Full version free to UCLA students, staff, and faculty for all Windows versions & Mac OS versions via BOL’s software area.
• ZoneAlarm – free for non-commercial use; firewall

For general info on securing your PC/Mac you might want to check out:

• http://www.scribd.com/doc/48356630/MakeUseOf-com-HackerProof-Your-Guide-to-PC-Security