Anti-virus software tends to be big and bloated, use plenty of RAM and system resources, and generally clog up your system. Worse is that increasingly, anti-virus makers make it difficult to buy anti-virus software by itself, and include firewalls, anti-spyware and other software with it. If you want a clean, mean piece of anti-virus software that does just one thing --- protect against viruses --- you'll want this program.

PcWorld (http://www.pcworld.com/downloads/file/fid,65455/description.html?tk=nl_ddxdwn)