Free antivirus software available includes:
Superantispyware.com (Superantispyware FREE version)lavasoft.com (Ad-aware)emsisoft.com (A-squared FREE)safer-networking.org (Spybot S&D)javacoolsoftware.com (SpywareBlaster, EULAlyzer, & MRU-Blaster)microsoft.com (Windows Defender)avira.com (Avira AV)activevirusshield.com (Basically Kaspersky for free)siteadvisor.com (Tells you how safe websites are)phoenixlabs.org (Blocks malware, government, and anti-p2p org's)zonealarm.com (Top Notch Firewall)comodo.com (Another Top Notch firewall)iobit.com (Advanced Windows Care)Eusing.com (Registry cleaner)ccleaner.com (Junk file cleaner)