Vatsis ,
That is whats called a "dialer" and it's not a virus but rather a "plug-in" . What happens is when you visit certain sites a script pops up , or in some cases doesn't show it self at all , asking you if you want to install some sort of evil program (XXX Toolbar and SmartSearch are 2 common ones). These people are such money-hungry , inbred bastards that some of their pop-up scripts are rigged in a way that no matter what you click (yes or no) it still installs the plug-in . This isn't a problem at all on cable or DSL because there is no phone line connected to the computer . But on dial-up it is a billion dollar a year nuisance that the governments from many countries have been trying to put a stop to for years . The main thing with malware of this sort is not detection and removal , but prevention of it being installed in the first place . After all , once a dialer is installed , it automaticlly starts trying to dial out , so after its called 25 numbers in South Micronesia and racked up a 5000 dollar phone bill , removal isn't your only problem .
Here's what I recommend your parents do .
1- Run Ad Aware , Pest Patrol , Spybot etc. and get the dialer plug-in removed .
2- Refuse to pay the phone bill , explaining what the nature of the charges are and that they were unaware of any outgoing phone calls from their computer . Fight it tooth and nail if they have to . Many phone companies will comply with such demands . Go over the phone companies head if they have to .
3- Abandon Internet Explorer and start using Mozilla Firefox browser or another alternate browser (Opera , Avant , MyIE2 etc.) which are , as of now , not exploited by any plug-in programs or scripts of any kind and as a bonus have very few , if any , advertising pop-ups .
Let me know if you need any further info on this V , would be happy to assist you .
F~