Spybot Search and Destroy 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 it finds such modules, it can remove them. In most cases the host still runs fine after removing the spyware/adware.

download:  SpyBot - Search and Destroy v1.6 RC2