AVG Antivirus 2012 (Free Edition)

Anti-Virus Guard (AVG) is a family of anti-virus and Internet security software for the Microsoft Windows, Linux, Mac OS X, and FreeBSD computing platforms, developed by AVG Technologies, a publicly traded Czech company formerly known as Grisoft.

^Features:

• Real-time scanning.
• Viruses, trojans, worms, spyware, provides protection against advertising tools.
• E-mail borne threats.
• Self update capability.
• Windows 7, Windows Vista and Windows XP compatible

After click on download button you'll get this:

 Please follow the above mentioned instructions.