Most of the time, even after the spyware has actually made its way onto the user`s system they are still unaware of its presence, because it often starts off by doing relatively subtle things to the system such as making changes including removing or switching around the temporary Internet files and changing the browser home page. The installation of spyware frequently involves Internet Explorer and this is a main reason why so many computer users are now choosing to use Mozilla Firefox, the alternative to IE. Spyware programs are rarely alone on a computer and usually come with other computer threats and components.