Avast

Avast is best software which make your computer virus free...

Avast! (styled avast!) is a freemium antivirus computer program available to Microsoft Windows, Mac OS X and Linux users, with a user interface available in 41 languages. Its developer, AVAST Software a.s. (formerly known as ALWIL Software a.s.), has headquartered in Prague, Czech Republic, with offices in Linz, Austria; Friedrichshafen, Germany; and San Mateo, California.
 The name Avast is an acronym of "Anti-Virus – Advanced Set". The official, and current logo of Avast! is a white orb with the letter 'a' on it and an orange circle around it, sticking out to four directions.
The central scanning engine has been certified by ICSA Labs and West Coast Labs' Checkmark process. It has been awarded VB100 Award by Virus Bulletin multiple times for 100% detection of "in-the-wild" viruses, and also won the Secure Computing Readers' Trust Award. Avast! (17,4% worldwide antivirus vendor market share) competes in the antivirus industry against Microsoft (13,2%), ESET (11,1% ), Symantec (10,3%), AVG Technologies (10,1%), Avira (9,6%), Kaspersky (6,7%), McAfee (4,9%), Panda (2,9%) and Trend Micro (2,8%) among others.

Website: www.avast.com