Anti Spyware Software
Spyware is any technology that gathers information about a person or organization without their knowledge. Generally speaking, when it comes to the Internet, spyware is some form of program that is put in someone's computer to secretly gather information about the user and relay it to advertisers or other interested parties.
Popular Anti-Spyware Software

The following list identifies the most commonly downloaded anti-spyware software1. This provides a loose representation of the latest consumer trends, identifying what software people are interested in trying or buying:
Ad-Aware® is designed to provide advanced protection from known Data-mining, aggressive advertising, Parasites, Scumware, selected traditional Trojans, Dialers, Malware, Browser hijackers, and tracking components. With the release of Ad-Aware SE Personal edition, Lavasoft takes the fight against Spyware to the next level.
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 with other users.
All-in-One Secretmaker combines several tools: a spam fighter, a pop-up blocker, a intruder blocker, a banner blocker, a movie blocker, a privacy protector, history cleaners, a worm hunter and a cookie eraser.
Spyware Doctor is a 5-star rated Spyware remover and provides real-time Anti-Spyware protection against Spyware, adware, Trojan horses, keyloggers, Spyware cookies, adbots, spybots, browser hijackers, phishing attacks and other Malware threats. Additionally it actively protects web browsing using Internet Explorer with a built-in popup blocker and malicious site guard.
3-time winner of PC Magazine’s Editors’ Choice award and a 5-star CNET rating, Webroot Spy Sweeper protects your PC from the consequences of spyware in two powerful ways. An advanced detection process, fueled by frequent threat updates, quickly finds and quarantines all forms of spyware installations so you can safely remove them without the risk of harming key PC operations. And Proactive Shields guard you against new spyware before it infects your system.