Most famous virus of the history:

1. Creeper. This is the first virus of the history. It was born in 1971. One of the features of Creeper is showing a message that infected the system and say, "I am the most terrifying (creeper), catch me if you can". It was created by Robert Thomas Morris. Thanks to this virus,  was created to eliminate it the Reaper program.

2. Melissa. This virus was the first to be sent by email in 1999. Although not as destructive, managed to spread and infect millions of users.

3. I love you. A thesis project submitted by a young Filipino 24 years, which was rejected in college, turned out to be a virus capable of infecting more than 45 million computers, costing more than 10 billion dollars. The program, which was created in 2000, sent an email that in his case showed the words 'I love you' (I love you) and was accompanied by an attachment named 'A love letter for you.' When you run the file, which in theory was a text document, the virus is resent to all user's contacts list.

4. Sasser:  Between April and May 2004, this plague computer alerted over a company by its high degree of danger because, to infect the computer, it was not necessary that the user opened a file.

5. Code Red:  this worm spreads by networks without email or a website.

6. Storm. In January 2007, users in Europe and the United States began receiving emails related to a storm (storm) that affected the European continent. The message had an attachment that infected the computer and immediately became part of a botnet, so they began to send and receive commands by its creator.

7. Slammer. This virus caused many Internet servers to your users show no service or caused excessive slowness of the Network

8. Concept. It is known as the first macro virus, it was included in Microsoft Word macro program. Born in 1995 and distributed through infected attachments, the user cueales did not know they had the virus. When the person receiving the attachment is infected just by opening the file on your computer and using Word.

9. Netsky. It is a family of viruses, viruses Netsky family became famous because they showed insulting messages alluding to the authors of the Bagle virus families and MyDoom and, in some cases, certain actions had eliminated the latter. From this came off a 'war' of virus.

10. Conficker. It is one of the latest virus, first detected in November 2008. The virus attacked a vulnerability in the Windows operating system.