Computer system viruses are produced by individuals who desire to trigger damage to others, or who desire to gain control over another person's computer. https://thumbpower.org/?p=716 The simplest method to create an infection is to take some existing code and customize it slightly. This new code can then be dispersed to others, who might unintentionally run it on their own computers. As soon as the virus is running, it can do anything its creator wants it to, including erasing files, taking data, or sending out spam. find out this here More advanced viruses can be very tough to spot and remove.