If you’ve always wonder just how a computer virus works and or spreads you should take a look at this video.
Not surprisingly, computer virus work in a similar manner to that of human virus in that it just takes one virus to infect something and it spreads from there.
Check out this video from “How things Work”:
As the video says, if you don’t have anti-virus protection on your computer you are just asking for a big problem. I use Norton Anti-virus because it comes free with my ISP, but there are some very good free antivirus programs out there such as AVG.