Avast Free Antivirus a the free for non-commercial and home usage antivirus solution from AVAST Software.
Avira Free Antivirus offers basic protection for your computer against dangerous viruses, worms, spy-ware, trojans and costly dialers.
ESET NOD32 Antivirus is an innovative host-based intrusion prevention system that offers a comprehensive scanning solution. Most importantly, it will not slow down your PC, it's easy to use, and easy to install.
AVG AntiVirus Free provides basic antivirus and antispyware protection for home users. Virus database updated every day. Includes innovative LinkScanner for web-protection.
Comodo Internet Security is a free, very voluminous and multi-layered security application that keeps hackers out and personal information in.
HitmanPro (formerly Hitman Pro) is an on-demand malware scanner and removal tool. It will usually do a full-system scan significantly faster than other (traditional) solutions due to its cloud-based scan technique.