A Downloader is a software application or part of the program which is designed to retrieve (download) and install additional files from the Internet. Malware programs often include Downloaders which allow the Malware to continually update themselves, thereby eluding detection.
Trojan/BHO/Toolbar/IBIS hijacks your saerch results. Lots of users don't read their terms and privacy policy. By agreeing you agree that they eill install other applications to your system.
