Uninstall previous versions before installing this one.SpyBot-S&D searches your hard drive for so-called spy- or adbots; little modules that are responsible for the ads many programs display. But many of these modules also transmit information about your surfing behaviour and more to the net.
Get it here from Major Geeks... http://www.majorgeeks.com/SpyBot-Search_&_Destroy_d2471.html
Or Patrick M Kolla's site... http://www.safer-networking.org/en/index.html