It is the worst nightmare of every computer user: you wake up one day and realize that you have a virus, and you don’t know quite how to get rid of it. Most people these days understand what a virus is and how harmful it can be, but they are still somewhat unsure how computer viruses spread. The truth is that there are dozens of different ways in which a virus can spread from computer to computer, but let’s take a look at the most frequent ways in which people run into viruses, spyware and Trojans on the Internet.