The Antivirus Software category contains programs developed to detect and remove computer viruses and other virus-related software from users' computers. Most software includes on-demand and scheduled antivirus scans. Many programs now include real-time antivirus protection and further spyware protection. Notable titles include AVG, Avira AntiVir, and Avast.
Download link : http://download.cnet.com/windows/antivirus-software/