Windows Defender is a free antispyware appication from Microsoft.
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Kaspersky Lab has developed the TDSSKiller utility for removing malicious rootkits. A rootkit is a program or a program kit that hides the presence of malware in the system.
Downloads: 24508 - Freeware - Download Now
Windows AntiSpyware (Beta) is a security technology that helps protect Windows users from spyware and other potentially unwanted software.
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HitmanPro is a second opinion scanner, designed to rescue your computer from nasty viruses, spyware, trojans, rootkits, and other threats, that have infected your computer despite all the security measures you have taken (such as anti virus software
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Spybot - Search & Destroy can detect and remove spyware of different kinds from your computer.
Downloads: 83199 - Freeware - Download Now