AVG Technologies - 144.65MB (Freeware)
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

AVG Anti-Virus Free Edition is only available for single computer use for home and non commercial use.

This is the 32-bit version.