Eliminates many variants of CoolWebSearch, which is a browser hijacker. CoolWebSearch works by overriding the DNS. This means that it intercepts any URLs that you try to go to, and sends you to where it wants you to go instead. Until fixed, you can only get to the sites you want by using their IP addresses (like "130.215.31.30") instead of their domain names (like "bb.tcwonline.org").

Destroys a massive variety of adware, spyware, etc. (but not viruses). Should be used in conjunction with an antivirus such as Norton (which destroys viruses, but not spyware). The Spybot site has a very useful tutorial which you should use once you've downloaded Spybot from the link above. Be sure to update it frequently -- here are instructions for that.