Money is the very crux of adware and spyware. These pose several problems and are a security risk.

Adware is a program that displays advertisements on the computer whether you want them or not. They are not just connected to particular websites or free software but are programmed to start up whenever your computer is switched on.

Programs like Eudora mail client display advertisements in lieu of charging registration fees for use of software. It helps developers recover program development costs. Kazaa the file sharing application comes bundled with at least three ad-ware programs. Two of them serve ads to the desktop while another redirects the user