Quick Selection Guide

Avast! Free Antivirus         Top pick for best free antivirus program, full real-time capabilities, behavioural blocking features, sandboxing, low rate of false positives   Detection rates slightly lower than AntiVir   http://www.avast.com/en-au/free-antivirus-download   http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?tag=mncol   59.65 MB    6.0.1000    Private Freeware (not free for commercial use)    2000 -7   Hybrid 32/64 Bit version available   Quick Start Guide - Forum

Microsoft Security Essentials       Very low rate of false positives, easy to use   Detection rates slightly lower than AntiVir, slow scanning   http://www.microsoft.com/Security_Essentials/   http://www.microsoft.com/Security_Essentials/   7-9 MB    2.1.1.1116    Unrestricted Freeware    XP - 7   64 Bit version available   Installation tips - Forum - Online help

Avira AntiVir Personal Edition         Outstanding detection of malware    Nag screen   http://www.free-av.com/en/products/1/avira_antivir_personal__free_antivirus.html   http://download.cnet.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html   53.4 MB    10.2.0.700    Private Freeware (not free for commercial use)    2000 - 7   Hybrid 32/64 Bit version available   Installation tips -  Forum - Online help

Panda Cloud Antivirus       High detection rate of malware, web protection, some behavioural blocker features   Detection rates of real-world malware is slightly lower   http://www.cloudantivirus.com   http://filehippo.com/download_cloud_antivirus   33.16 MB    1.4.0    Private Freeware (not free for commercial use)    XP - 7   64 Bit version available

AVG Anti-Virus Free       Behavioural blocker   Slightly lower signature detection rates   http://free.avg.com/au-en/homepage   http://filehippo.com/download_avg_antivirus_32/   150.83 MB    2012.0.1796    Private Freeware (not free for commercial use)    2000 - 7   64 Bit version available   AVG forum