A program that can secretly change your dialup connection setting so that instead of calling your local internet provider, your PC calls are routed to an expensive 0900 or international phone number.
From the EULA,
"The FREE PLUGIN software provide You the opportunity to download a software product that periodically deliver advertisements and promotional messages to Your computer based. The frequency and the functioning of these messages are described thereinafter."
Once this dialer is installed onto the PC, it adds several pornography related sites to the IE trusted zone.