Ad-Aware Free Internet Security - v9.0 - 117 MB - Freeware - Windows 2000 / XP / server 2003 / Vista / 7

Ad-Aware Internet Security gives you the power to combat even the most complex forms of malware, protecting you from viruses, spyware, trojans, rootkits, keyloggers, password stealers, and much more.

avast! Free Antivirus - v5.1 - 56,1 MB - Freeware - Windows 2000 / XP / Vista / 7

Our avast! Free Antivirus often outperforms our competitors´ paid products and is the minimum protection you should have. It provides great protection against viruses and spyware. But for best protection against the latest and constantly changing internet threats, upgrade to avast! Internet Security.

AVG Anti-Virus Free - v10.0.1204 - 4,51 MB - Freeware - Windows XP / Vista / 7

Millions of people around the world use AVG Anti-Virus Free for their basic online activities. Whether it's surfing the Internet, conducting web searches, or simply keeping up with friends on Facebook, AVG Anti-Virus Free has got you covered.

Avira AntiVir Personal Antivirus - v10 - 47,4 MB - Freeware - Windows 2000 / XP / Vista / 7

Avira AntiVir Personal - FREE Antivirus is a reliable free antivirus solution, that constantly and rapidly scans your computer for malicious programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts promptly when a malicious program is detected.

BitDefender Free Edition - v10 - 154 KB - Freeware - Windows 98 / NT / ME / 2000 / XP

BitDefender Free Antivirus Edition is your chance to use one of the world's most effective antivirus engines for free! BitDefender Free Edition uses the same ICSA Labs certified scanning engines found in other BitDefender products, allowing you to enjoy basic virus protection for no cost at all.

ClamWin Free Antivirus - v0.97 - 36,1 MB - Open Source - Windows 98 / ME / 2000 / XP / server 2003 / Vista / 7

ClamWin is a Free Antivirus program. ClamWin Free Antivirus comes with an easy installer. It features: High detection rates for viruses and spyware, Scanning Scheduler, Automatic downloads of regularly updated Virus Database and more.

Emsisoft Anti-Malware - v5.1.0.4 - 99,8 MB - Freeware - Windows XP / Vista / 7

Scan your hard disk with the Emsisoft Anti-Malware Scanner and remove all infections. Keep your PC clean, and restore it to maximum performance. Stop Malware before it has a chance to harm you. The guard prevents dangerous programs from becoming active on your PC, blocking Malware through the use of unique behavioral analysis technology.

ESET NOD32 Antivirus - v4.2.71.2 - 42,0 MB - Commercial Trial - Windows 2000 / XP / server 2003 / Vista / 7

ESET NOD32 Antivirus uses a powerful combination of advanced heuristic technologies and automatic updates of malware signature databases, detecting and eliminating a rapidly growing number of unknown threats.

HijackThis - v2.0.4 - 379 KB - Freeware - Windows 98 / ME / 2000 / XP / Vista / 7

Scan your computer with HijackThis to find settings changed by spyware, malware, or other unwanted programs. HijackThis is now Windows 7 compatible. It generates in-depth log reports for Windows-operated systems, including Windows 7.

Kaspersky Anti-Virus - v11.0.2.556 - 110 MB - Commercial Trial - Windows XP / Vista / 7

Kaspersky Anti-Virus; the backbone of your PC's security system, offering real-time automated protection from a range of IT threats. Kaspersky Anti-Virus provides the basic tools needed to protect your PC. Our award-winning technologies work silently in the background while you enjoy your digital life.

Microsoft Security Essentials - v2.0.657.0 - 9,45 MB - Freeware - Windows XP / Vista / 7

Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software. Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It’s easy to tell if your PC is secure — when you’re green, you’re good. It’s that simple.

Norton AntiVirus - v18.1.0.37 - 98,8 MB - Commercial Trial - Windows XP / Vista / 7

Norton AntiVirus blocks viruses and spyware with advanced protection. It helps protect your entire computer by stopping viruses, spyware, and other security risks. Norton AntiVirus works in the background so you can surf the Internet, read the news, play games, and download software or music without disruption.

Spy Sweeper - v6.1.0 - 40,1 MB - Commercial Trial - Windows 2000 / XP / Vista / 7

Webroot Spy Sweeper's advanced detection and spyware removal software is effective at fully removing even the most malicious spyware programs in a single sweep. You won't have to scan and restart your PC a number of times with Spy Sweeper - one sweep and your PC is clean.

Spybot - Search and Destroy - v1.6.2 - 15,6 MB - Freeware - Windows 98 / ME / NT / 2000 / XP / server 2003 / Vista / 7

Spybot - Search and Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies.

Spyware Doctor - v8.0.0.624 - 500 KB - Freeware - Windows XP / Vista / 7

Spyware Doctor delivers powerful antispyware protection with minimal impact to your PC. It defends your computer against malware attacks with multiple techniques using proactive, reactive, and automatic protection to stop threats at every entry point. Now includes memory scanning, behavior profiling, and protection report cards to provide up-to-date protection and status monitoring for your PC.

Spyware Terminator - v2.8.2.192 - 651 KB - Freeware - Windows XP / Vista / 7

Bring your computer protection to the next level ! Get a unique combination of real-time antispyware protection and alerts that help prevent you from entering potentially dangerous websites. Extended detection of malware during scans and within the Real-Time Shield. Spyware Terminator prevents spyware from infecting your computer.

SpywareBlaster - v4.4 - 3,04 MB - Freeware - Windows 98 / MT / 2000 / XP / Vista / 7

Spyware, adware, browser hijackers, and dialers are some of the most annoying and pervasive threats on the Internet today. By simply browsing a web page, you could find your computer to be the brand-new host of one of these unwanted fiends!

SuperAntiSpyware - v4.48.1000 - 9,93 MB - Freeware - Windows 2000 / XP / Vista / 7

SUPERAntiSpyware is 100% Free and will detect and remove thousands of Spyware, Adware, Malware, Trojans, KeyLoggers, Dialers, Hi-Jackers, and Worms. SUPERAntiSpyware features many unique and powerful technologies and removes spyware threats that other applications fail to remove.

WinPatrol - v20.0.2011 - 779 KB - Freeware - Windows XP / Vista / 7

WinPatrol allows you to efficiently monitor programs running on your computer without slowing you down or hogging all your memory. WinPatrol takes snapshot of your critical system resources and alerts you in real-time to any changes that may occur without your knowledge. You'll be notified of critical system changes and have access to over 30,000 easy to understand program descriptions.