ZoneAlarm Pro FREE Protect your computer from hackers and control who has access to your files. Defeat trojans and protect your PC.

Panda Antivirus Offers excellent virus protection at a reasonable price. 

AVG Free  This is an excellent little virus scanner for folks who don't want to pay the money for a fancy scanner or software suite.

Malwarebytes' Anti-Malware  Malwarebytes' Anti-Malware is considered to be the next step in the detection and removal of malware. They have compiled a number of new technologies that are designed to quickly detect, destroy, and prevent malware. Malwarebytes' Anti-Malware can detect and remove malware that even the most well-known Anti-Virus and Anti-Malware applications on the market today cannot. Download the Free Trial
 

RogueRemover PRO     RogueRemover PRO will not only remove rogue applications already installed on your computer, but will also keep them from being installed with its real-time RogueMonitor. RogueMonitor will alert you before you download a rogue application keeping you safe and secure before trouble occurs. It will also let you remove a rogue application you may have already downloaded with a simple mouse click. Furthermore, RogueRemover PRO has the ability to immunize your computer to keep it from being able to access a rogue website ever again.  Download the Free Trial

Spy No More  SpyNoMore scans, cleans and blocks spyware as well as any other good anti-spyware product, but with one big advantage, Custom Fix (patent pending).  Download the Free Trial

Anihc AntiSpyware Anihc AntiSpyware is an essential security you need to safeguard all your data and files. With automatic scans, updates, and outbreak alerts, you can rest easy knowing you have systematic, ongoing protection against the latest malicious viruses, worms, Trojan horse programs, and spyware.   Download the Free Trial

SmartFix Security Centre  Whether you are on the Internet extensively or only rarely share files with others, feel safe that SmartFix Security Center tools are protecting your PC in real-time as well as any providing you with the ability to fix historical problems that your PC may have.    Download the Free Trial

StartGuard Pro StartGuard is a 5-Star award-winning spyware blocker that not only scans and cleans your PC, it prevents spyware, adware, dialers, Trojan horses, worms, tracking cookies, browser hijackers, and other malware from downloading in the first place. Download the Free Trial

Kaspersky Internet Security 7.0 Three protection technologies against new and unknown threats: 1) Hourly automated database updates, 2) Preliminary behavior analysis, 3) On-going behavior analysis. New! Protection from viruses, Trojans and worms Protection from spyware and adware Real-time scanning for email, Internet traffic and files Protection from viruses when using ICQ and other IM clients Protection from all types of keyloggers. Improved! Detection of all types of rootkits. Improved! Automatic database updates   Download the Free Trial

AdwareAlert Anti Adware  Award-winning Windows adware software removal, spyware removal program, Spyware Adware Cease used to effectively protect your PC against various adware spyware attacks that can generate unwanted pop-ups, slow down PC performance, or steal your privacy without you knowing it! Download the Free Trial

Spy Cleaner Gold   A slick interface sports controls similar to its competitors, offering options for scanning your drives and Registry, updating online, and saving the last, best system set-up as a backup. Scanning is fairly quick compared to other programs in the category. Download the Free Trial

Trend Micro    Makers of PC-Cillin. Trial versions available, and they also offer "Housecall," a free service that scans your p.c. for viruses from a remote location.