SpyBot Search & Destroy Download & Review
SpyBot-S&D searches your hard drive for so-called spy- or adbots; that is, little modules that are responsible for the ads many programs display. Many of these modules also transmit information, including your surfing behavior on the Internet. If SpyBot-S&D finds such modules, it can remove them. In most cases the host still runs fine after removing the spyware/adware.