It is said that there are three types of computer virus that cause problems for any users. Firstly, a Trojan Horse takes credit card details or bank passwords. Secondly, a Spyware gathers information about the computer’s owner. Finally, a Spam is used for cheating people and for taking money from them (Philpot, 2011:47).
Reference:
Philpot, S. (2011). "Computer under Attack." Academic Skills. Oxford: Spain.
