Stinger is a quick and installation-free standalone tool for detecting and removing prevalent malware and threats, ideal if your PC is already infected. While not a replacement for full fledged antivirus software, Stinger is updated multiple times a week to include detection for newer Fake Alert variants and prevalent viruses.
ESET Smart Security is a security suite for your PC including the following solutions: Anti-Virus, Anti-Spyware, Anti-Rootkit, Anti-Spam, Anti-Theft, Firewall, Parental Control, and Web and Email protection. ESET Smart Security ranks among the leaders in virus, trojan and spyware detection and deletion. It's very fast and uses less system resources than most competitors.
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.