This is precisely one of the best things about AVG. It works completely in the background, without the need of half the system resources and of course, without constantly bothering you with warning windows or update messages. You can just go on with your work and you won't even notice you have an antivirus application up and running. Being the free version of a complete program, AVG shows the odd nagging notification encouraging you to buy AVG Professional which may annoy the more sensitive users

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. Version 8.0.233 includes wide array of bug fixes and improvements, included a revamped UI that allows easier management via keyboard.

PScanner++ helps you to find packed files, processes, and services on your system. Frequently, malware are packed and hidden in many different folders, therefore is much difficult to find every reply of them. It has an hijacker's module and support for ADS (Alternate Data Streams), private filename (lpt1, com1, and null), and RootKit detector. Much useful is the tasks (scheduler) viewer on infected system and unlocker.

TrustPort Antivirus 2009 is a compact software solution for computer security against harmful codes, spam, fraudulent websites and other risks. At all entry points of the computer, it provides antivirus, antispyware, antiadware protection. It controls incoming mail, it checks web pages and documents, and it automatically offers scanning of a removable drive when connected. Data in the computer are scanned in two ways; files are either scanned automatically on access or manually on demand. It is possible to plan regular scanning of selected disks or folders and regular updates of virus patterns. The user can choose from up to five scanning engines by renowned world manufacturers; he can decide which engines and for what tasks will be used. Parental lock enables blocking of web pages not suitable for children and youth. It is possible to select categories of web pages that should not be open, for example with pornographic or violent content. Antiphishing module prevents the users from opening a fraudulent web site, aimed at luring out sensitive personal data. In comparison with previous versions, TrustPort Antivirus 2009 has a more current graphical user interface and neat new icons. In addition to the default skin, the user can choose from hundreds of other skins, available for free on the internet.

Protects your computer against dangerous viruses, worms, Trojans and costly dialers.

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.

Avira AntiVir Personal - Free Antivirus is a comprehensive, easy to use antivirus program, designed to offer reliable free of charge virus protection to home-users only. Avira offers: Extensive Malware Recognition of viruses, Trojans, backdoor programs, worms, etc. Automatic incremental updates of antivirus signatures, engine and entire software. Permanent virus protection, with Virus Guard real time monitoring. Install and configuration in just a couple of steps. Virus protection against known and unknown threats, using an advanced heuristic system.

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.

HijackThis lists the contents of key areas of the Registry and hard drive--areas that are used by both legitimate programmers and hijackers. The program is continually updated to detect and remove new hijacks. It does not target specific programs and URLs, only the methods used by hijackers to force you onto their sites. As a result, false positives are imminent, and unless you're sure about what you're doing, you always should consult with knowledgeable folks before deleting anything. Version 2.0.2 includes unspecified updates.

Norton AntiVirus 2009 provides fast, responsive defense against all types of malicious software including viruses, spyware, worms, and other software threats. It protects your system without slowing it down. Rapid pulse updates every 5 to 15 minutes help to ensure that you're protected from the latest threats. Working quickly and quietly in the background, Norton AntiVirus requires little memory and system resources.