Spybot - Search & Destroy - Download.com - Free downloads, shareware, and more.: "The release of the latest version of Spybot - Search & Destroy adds some truly useful features to an already excellent app.
Not only does Spybot check your system against a comprehensive and timely database of adware and other undesirable system invaders, the new Immunize feature provides a front-line defense against a plethora of uninvited Web-borne flotsam, blocking it before it reaches your computer.

Spybot includes a set of incredibly useful tools
that complement its basic functionality, including
Secure Shredder, for completely destroying files;
Hosts File, for blocking adware servers from your computer; and System Startup, which lets you review which apps load when you start your computer.

The ugly but functional interface features advanced and easy modes, but it doesn't let you switch between them while it is running. The functionality of Spybot makes it a must-have for all Internet users, and this version is a worthwhile upgrade if you have a previous install. "