AVG Free Edition 2012.0.1809 

AVG Anti-Virus Free Edition is trusted antivirus and antispyware protection for Windows available to download for free. In addition, the new included LinkScanner® Active Surf-Shield checks web pages for threats at the only time that matters - when you're about to click that link.
AVG Anti-Virus Free has these following features:

• Award-winning antivirus and antispyware
• Real-time safe internet surfing and searching
• Quality proven by 80 million of users
• Easy to download, install and use
• Protection against viruses and spyware
• Compatible with Windows 7, Windows Vista and Windows XP