# Anti-virus, firewall and Internet security software

- **[<span class="caps">AVG</span> Anti-virus](http://www.grisoft.com/)** – free; anti-virus
- **[Microsoft Security Essentials](http://www.microsoft.com/Security_Essentials/)** – Free anti-virus and anti-spyware from Microsoft. Supercedes Windows Defender (see below). Also, [Security Essentials definitions](http://www.microsoft.com/security/portal/Definitions/HowToMSE.aspx)
- **[Microsoft Windows Defender](http://www.microsoft.com/downloads/details.aspx?FamilyId=435BFCE7-DA2B-4A6A-AFA4-F7F14E605A0D&displaylang=en&mg_id=10134)** – 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](http://www.microsoft.com/security/portal/ADL.aspx)
- **[Norton Internet Security](http://www.Symantecstore.com/NortonSecurity)** – non-free; anti-virus, firewall, spam/phishing protection, parental control
- **[Sophos Anti-Virus](http://www.sophos.com/)** – shareware; anti-virus. Full version free to <span class="caps">UCLA</span> students, staff, and faculty for all Windows versions &amp; Mac OS versions via [BOL’s software area](http://www.bol.ucla.edu/software/sophos/).
- **[ZoneAlarm](http://www.zonealarm.com/)** – 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](http://www.scribd.com/doc/48356630/MakeUseOf-com-HackerProof-Your-Guide-to-PC-Security)