Avast Home Edition is a complete ICSA & Checkmark certified antivirus, Checkmark certified anti-spyware & anti-rootkit package. Avast includes the following components: On demand scanner with skinnable simple interface, just select what do you want to scan in which way and press the Play button; On access scanner, special providers to protect the most of available e-mail clients; Instant messaging--ICQ, Miranda; Network traffic--intrusion detection, lightweight firewall; P2P protection for Kazaa, BitTorrent; Web shield--monitors and filter all HTTP traffic; NNTP scanner--scans all Usenet Newsgroup traffic and all operations with files on PC; Boot time scanner--scans disks in the same way and in the same time as Windows CHKDSK does.
http://www.avast.com

AVG Free Edition is the well-known antivirus protection tool. AVG Free is available free of charge to home users for the life of the product. Rapid virus database updates are available for the lifetime of the product, thereby providing the high level of detection capability that millions of users around the world trust to protect their computers. AVG Free is easy to use and will not slow your system down (low system resource requirements. Highlights include automatic update functionality, the AVG Resident Shield, which provides real-time protection as files are opened and programs are run, free Virus Database Updates for the lifetime of the product, and AVG Virus Vault for safe handling of infected files.
http://www.grisoft.com

Avira AntiVir PersonalEdition Classic is a comprehensive, easy to use antivirus program, designed to offer reliable free of charge virus protection to home-users only. Avira offers: 1.Extensive Malware Recognition of viruses, Trojans, backdoor programs, worms, etc. 2.Automatic incremental updates of antivirus signatures, engine and entire software. 3.Permanent virus protection, with Virus Guard real time monitoring. 4.Install and configuration in just a couple of steps, setup to protect your PC in minutes. 5.Virus protection against known and unknown threats, using an advanced heuristic system. 6.Scheduler where you can set the scanner to make automatic virus scans or updates on your system. 7.Forum and phone support, Knowledge Base with virus descriptions available on web site. 8.Vista Support. 9. Rootkit Detection and Removal. Version 7.06.00.270 adds Rootkit Protection.
http://www.avira.com

ClamWin Antivirus is antivirus software for Windows. It provides a graphical user interface to the Clam AntiVirus engine. ClamWin uses the GNU General Public License. ClamWin Antivirus comes with an installer and open source code at no cost. It features: scanning scheduler, automatic virus database updates, atandalone virus scanner, integration to MS Windows Explorer, and add-in to MS Outlook.
http://www.clamwin.com

EAV Antivirus Suite can detect and eliminate spyware, Trojans, key loggers, adware programs, browser hijackers, cookies, spy bots, trackware, and other malware, even new and unknown ones, on your PC. EAV Antivirus Suite will scan all running processes, local files in real time automatically once you run the software. Once spyware or other malware appears, even if it hides in other programs, EAV Antivirus Suite will display a signal for warning and will eliminate it consequently. Meanwhile, this software will clear all spyware-system-linked files as well as relative registry files. EAV Antivirus Suite can recover all damages with Internet Explorer caused by JavaScript and ActiveX viruses. And it can also help you to fulfill anti-hacker Windows settings.
http://www.your-soft.com

PC Tools AntiVirus Free Edition protects you against the most nefarious cyber-threats attempting to gain access to your PC and personal details. Going online without protection against the latest fast-spreading viruses, worms and Trojans can result in infections within minutes. Once infected, the virus will usually attempt to spread itself to your friends, family and associates by accessing your e-mail contacts and networked PCs. The infection may also allow hackers to access files on your PC, use it to launch attacks against other computers and Websites or to send mass spam email. That's why PC Tools AntiVirus Free Edition provides protection, with rapid database updates, OnGuard real-time file, Internet & e-mail protection and comprehensive system scanning to ensure your system remains safe and virus free.
http://www.pctools.com

ThreatFire is unlike traditional antivirus products that rely on old fashioned "signature" technology and require updating every time a new threat occurs. ThreatFire's patent-pending ActiveDefense technology provides powerful protection against zero-day and emerging threats. It constantly monitors for both known and unknown viruses, worms, trojans, rootkits, buffer overflows, spyware, adware and other malware. It uses behavioral analysis to hunt down and paralyze threats that are too new or too clever to be recognized by traditional "signature-based" antivirus software. ThreatFire is the perfect complement to traditional antivirus programs.
http://www.pctools.com

The Ashampoo FireWall makes it easy for anyone to set up an effective, free firewall. Its Configuration Assistant guides you through every step of the the setup process. Easy Mode makes using it a breeze. You dont need any special technical knowledge, and everything is explained clearly. Even with its additional security tools, Ashampoo Firewall is a tiny program that uses very little memory and computer resources. You get heavy-duty protection without a heavyweight load on your system. The Ashampoo FireWall user interface explains itself every step of the way. The information is right there on the screen where you need it so that most users will never need to consult the help files.
http://www.ashampoo.com

PC Tools Firewall Plus Free Edition is a powerful personal free firewall for Microsoft Windows that protects your computer from hackers and intruders. Firewalls control the network traffic in and out of your PC by monitoring applications that connect to the network. Firewall Plus can stop Trojans, backdoors, and keyloggers from damaging your computer and stealing your private information. PC Tools Firewall Plus is advanced technology designed specially for people, not experts. Powerful prevention against attacks and known exploits is activated by default and advanced users can also easily create their own packet filtering rules to customize the network defenses. The program is recommended for use alongside of AntiSpyware and Antivirus software like AVG or Spyware Doctor to protect PC against Spyware, hackers, worms, and viruses.
http://www.pctools.com

ZoneAlarm is designed to protect your DSL- or cable-connected PC from hackers. This program includes four interlocking security services: a firewall, an application control, an Internet lock, and Zones. The firewall controls the door to your computer and allows only traffic you understand and initiate. The Internet lock blocks Internet traffic while your computer is unattended or while you're not using the Internet, and it can be activated automatically with your computer's screensaver or after a set period of inactivity. Zones monitor all activity on your computer and alert you when a new application attempts to access the Internet. Version 7.0.362 may include unspecified updates, enhancements, or bug fixes.
http://www.zonelabs.com

1-2-3 Spyware Free provides automatic protection against all known threats; detects and removes all kinds of viruses, spyware, Trojan and harmful components that might sneak into your PC. Real-time protection notifies you about suspicious activities, and allows you to block hazardous attempts. Scheduled system scan and updates maintain security on regular basis. The Undo option provides you with ability to roll back deleted infected entries. Version 4.5 adds real-time protection.
http://www.smartpctools.com

Security must not be a privilege. Under this motto, Emsi Software provides the Malware scanner a-squared Free completely free of charge for private use. But it is not a very limited version, it is a full tool to clean your computer from Malware. Not only Spywares, as detected by classic Anti-Spyware programs, but also especially Trojans, Backdoors, Worms, Dialers, Keyloggers and a lot of other destructive pests, which makes it dangerous to surf the web.
http://www.emsisoft.com

With the ability to scan your RAM, Registry, hard drives, and external storage devices for known data-mining, advertising, and tracking components, Ad-Aware 2007 easily can clean your system, allowing you to maintain a higher degree of privacy while you surf the Web. Ad-Aware 2007 includes a redesigned engine, improved code sequence identification, incremental definition updates, one-click Web-history cleanup, multiple browser support, and other new features.
http://www.lavasoft.com

AntiHook is a real-time Intrusion Detection and Prevention (IDP) system that dynamically protects users from malicious software such as unseen viruses, Spyware, Rootkits, Keyloggers, Code Injection, and Trojans. AntiHook detects and prevents attacks in real-time. AntiHook can operate as a standalone module, relying on its local database only and not requiring an update of data definitions. AntiHook ensures the integrity of the operating system by blocking and reporting any suspicious activity, including the following: launching of malicious applications and processes, termination of critical security applications (e.g. Firewall, Anti-Virus), loading of suspicious DLLs (e.g. BHOs, ActiveX), malware modifying the memory space of an external application and executing malicious code, kernel rootkits that maliciously alter the Windows operating system, registration of programs for loading on PC start-up or when the user logs on to the system, malicious system-wide Windows hooks. Designed for home users only.
http://www.infoprocess.com.au

Benefiting from previous experience, the new BitDefender Free Edition was designed with a centralized management console, which allows protection options configuration for all BitDefender modules. It is enough to open the management console in order to have access to all modules: Virus Scan, Scheduler, Live! Update, Quarantine, Reports. On demand scanning - Powerful scan engines ensure detection and removal of all viruses in the wild every time you need it. You can schedule the checking of your system at any time, periodically, without any other intervention. With just a right click you can check your files and folders. Automatic and manual update are available. Intelligent update of antivirus protection, without your intervention. The update can be done from the network over the Internet, directly or through a Proxy Server. There are over 90,000 Virus Definitions.
http://www.bitdefender.com

Download a free anti-virus and anti-spyware scanner based on the Dr.Web engine. As hundreds new viruses appear and spread in hours around the world daily, CureIt! with the newest definitions to the virus bases is re-built several times every day. The utility will quickly scan and cure, if necessary, your computer without installation of the Dr.Web Anti-virus. Dr.WEB CureIt! detects and removes: mass-mailing worms; e-mail viruses; peer-to-peer viruses; Internet worms; file viruses; Trojans; stealth viruses; polymorphic viruses; bodiless viruses; macro viruses; MS Office viruses; script viruses; spyware; spybots; password stealers; keyloggers; paid dialers; adware; riskware; hacktools; backdoors; joke programs; malicious scripts; other malware.
http://www.drweb.com

Dynamic Security Agent is a Free desktop defense product that delivers signature-less, zero-hour protection from known or new malware and intrusions for Windows desktops and servers. DSA continuously evaluates system processes, applications, WinAPI calls, registry and other system variables to detect, quarantine and/or block potential threats. DSA incorporates anomaly detection components that baseline normal computer operation and detect unacceptable deviations from typical use. Version 2 adds Windows Vista support.
http://www.privacyware.com

Swift AntiVirus offers comprehensive protection against viruses, worms, Trojans and dialers. It checks and protects all the relevant system areas of your computer. Swift AntiVirus is a stand-alone utility used to detect and remove major viruses. It is not a substitute for full anti-virus protection, but rather a tool to assist administrators and users when cleaning infected systems.
http://www.app-zilla.com

GeSWall is intrusion prevention system that is non-intrusive and easy to use. With GeSWall, you can safely surf the Web, use e-mail, chat, exchange files, regardless of the security threats posed by the Internet. GeSWall is a required supplementary to your anti-virus, anti-spyware and personal firewall as it blocks unknown treats missed by those solutions.
http://www.gentlesecurity.com

Haute Secure is free security software that combines brand-new technologies and community features to keep you safe from malicious software on the Internet. It provides protection from Web sites, advertisements, photos, and embedded links that expose users to malware designed to steal personal data and take control of computers. Haute Secure also prevents first-victim attacks never-before seen on the Internet. You also get additional protection for free from a community security experts and organizations joining the fight against malware, including Google, Spamhaus, and Phishtank. Haute Secure allows you to subscribe to additional site-safety lists created by community members or create your own blacklists to use privately or share with other Haute Secure users.
http://www.hautesecure.com

Are you suspecting a hidden spyware, backdoor, Trojan horse or rootkit is stealthily running in your PC? Don't worry! HiddenFinder can dig out the hidden malicious program and kill them instantly. HiddenFinder shows all running processes and driver including hidden process, which can be killed instantly. The termination of hidden process immediately stops a major portion of the Trojan or viral software attack.
http://www.wenpoint.com

iClean is a free program from MooSoft Development to remove malware including rootkits. It generally requires a knowledgeable user or the help of a professional. Support is available for free on MooSoft forums. Version 1.0.0.135 is a bug fixing release.
http://www.moosoft.com

Malware Immunizer is created to protect your system against known malware (virus, trojan, spyware, adware, backdoor, other harmful programs) and maybe unknown ones, it also detect and remove malware. It includes a Hosts file updater to block malicious websites, advertisements and tracking cookies. It also has a Hosts file checker to detect and remove hijackers. Now it includes junk files cleaner.
http://www.faltronsoft.org

PC Security Test is a free program for Windows that checks computer security against viruses, spyware and hackers. With a few mouse clicks, users can easily control the efficiency of their protection software (anti-virus programs, spyware scanners and firewalls). PC Security Test simulates virus, spyware and hacking attacks and monitors the responses of your protection software. Don't worry, no real viruses are involved. After the tests are complete, PC Securtiy computes a security index and provides tips on improving PC security. The software also includes a quiz that allows users to test their knowledge of computer security. A printable guide entitled "10 Tips for Securing Your Computer", written by computer security experts, is also provided with the program.
http://www.pc-st.com

In recent tests with Prevx CSI, it was found that 1 in 6 businesses were unknowingly infected. Is yours? Check your PC now, quickly and easily with Prevx CSI. Prevx CSI is the world's fastest and most advanced malware scanner, helping hundreds of people every day to detect and fix Rootkit, Spyware, Trojan, Virus, Keylogger and even targeted infections that have evaded their existing security. Our research has shown that many of the leading security vendors are missing hundreds of new infections each and every day. Infections that could be present in your PC today. Prevx CSI makes it simple to check your PC quickly and easily, with no need to change your existing security solution, or worry about the usual conflicts from running 2 security programs. Prevx CSI allows you to benefit from the knowledge gained from the Prevx community. Runs independently and as many times as you like, always up-to-date and checks with the up-to-the-second Prevx community database for the latest threats.
http://www.prevx.com

Stop spyware trojans now! ProcessGuard is a multi-award winning cutting-edge program that greatly increases the security of your computer by preventing processes from being able to attack each other. It is considered by experts to be a must-have program for all users of Windows, and is the only program available that can actually prevent the installation and infection of all known rootkit stealth trojans. ProcessGuard protects your system against such a wide variety of attacks, but one of the most important aspects of ProcessGuard is that it secures your other security layers. For example, ProcessGuard will stop your firewall and anti-virus programs from being attacked by trojans and viruses. Remember, without ProcessGuard even your security software is vulnerable. We recommend running a free rootkit remover and then installing ProcessGuard. Protect yourself BEFORE rootkits become too advanced for rootkit removal software to fight.
http://www.diamondcs.com.au

SafeSpace eliminates the problem of malware by creating a secure barrier between your computer and the internet, protecting you and your personal information against known and unknown malware threats. SafeSpace isolates internet facing applications in a virtual sandbox, which protects your system files and settings from unwanted changes, and blocks unauthorized access to your private files and data. When you next log off, or purge SafeSpace all virtualized changes are wiped, leaving your computer clean and malware free. Downloaded files are tracked by SafeSpace to ensure that they always open in the virtual sandbox. Tracked files can be saved to any disk location and stored alongside private files without any additional management. Surf in complete safety. Download with absolute confidence. Log off knowing your computer is clean and your personal information remains private.
http://www.artificialdynamics.com

Sentinel works by analyzing exploits in both your Registry and your system folders; integrating with ANY Anti-Virus program to quarantine these threats. Sentinel's Integrity Checker will notify your anti-virus/trojan application(s) if any file has been modified or added in any way whatsoever (using either a heavily optimized CRC32, SHA-1, MD5 or MD4 algorithm--for those of you who don't speak geek: Sentinel is fast, and very secure). Sentinel's RegWatch will watch over your startup registry entries, as well as other commonly exploited tactics viruses use to load--if any file seems suspicious, it is audited.
http://www.runtimeware.com

Spybot - Search & Destroy can detect and remove a multitude of adware files and modules from your computer. Spybot also can clean program and Web-usage tracks from your system, which is especially useful if you share your computer. Modules chosen for removal can be sent directly to the included file shredder, ensuring complete elimination from your system. For advanced users, it allows you to fix Registry inconsistencies related to adware and to malicious program installations. The handy online-update feature ensures that Spybot always has the most current and complete listings of adware, dialers, and other uninvited system residents.
http://www.safer-networking.org

Spyware Doctor with AntiVirus Starter Edition is the worlds' most awarded anti-spyware software and provides advanced technology designed especially for people, not just experts. It is automatically configured out of the box to give you optimal protection with limited interaction so all you need to do is install it for immediate and ongoing protection. Protection against: spyware, adware, trojans, virus, worm, keyloggers, identity theft, hijackers, tracking threats, spybots, rogue anti-spyware, unwanted software, phishing, pop-ups, and bad Web sites. Starter Edition is a free version of Spyware Doctor with AntiVirus, with full scan and remove, real-time file protection and no time limit.
http://www.pctools.com

Safely open any e-mail attachment, run any program, visit any Web site, and download any file. Finally, use modern virtualization technology for Internet security and privacy protection. Virtual Sandbox provides you more security and confidence than any legacy antivirus available. Virtual Sandbox is a simple install-and-forget solution to your virus, spyware, malware, and intrustion concerns. Every program that is downloaded and run will execute only in an isolated environment with its own stripped down and detached view of files and registry keys and its own empty synthetic user profile. File and registry changes are discarded when the virtual sandbox is destroyed. See what downloaded programs are up to. File and registry operations occuring in a sandbox can be easily viewed using the comprehensive Sandbox Explorer. Supports IE, Firefox, Opera, Mozilla, Avant, AOL, and Netscape browsers.
http://www.fortresgrand.com