Spybot Search & Destroy
Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you havent intentionally installed if your browser crashes inexplicably or if your home page has been hijacked (or changed without your knowledge) your computer is most probably infected with spyware. Even if you dont see the symptoms your computer may be infected because more and more spyware is emerging. Spybot-S&D is free so theres no harm giving it a try to see if something has invaded your computer. Spybot S&D can also clean usage tracks an interesting function if you share your computer with other users and dont want them to see what you have been working on. And for professional users Spybot-S&D allows you to fix some registry inconsistencies and extended reports.