Viruses and menaces been always a problem for PC users. Either someone trying to infect your pc , or the newly downloaded software is infected with malware , or even websites using malicious codes. Here are 5 best antivirus software to help you out clean these menaces , and have a clean , nice , and fast surfing.

Avast , free antivirus! http://avast.en.softonic.com/download
Short description : Expect great all-around protection against viruses and trojans. 
 
AntiVir free version! http://antivir.en.softonic.com/download
Short description : Lightweight and solid. Good ratings. Worth looking into. 
 
AVG free edition: http://avg.en.softonic.com/download
Short description : Not as good as Avast or Avira but with considerably less bloat. The most popular free antivirus. 
 
Microsoft Security Essentials: http://microsoft-security-essentials.en.softonic.com/download
Short description : Simple, lightweight and competent protection suite. 
 
Comodo Internet Security : http://comodo-internet-security.en.softonic.com/download
Short description : Free security suite, includes both a firewall and anti-virus protection.