7 Most Catastrophic Computer Viruses of All Time

3. ILOVEYOU

Estimated Damage: $15 billion

This affectionate piece of malware is one of the most virulent pieces of code in the history of the world wide web. It started out as an email attachment masked as a love message in a text file. While its creator claims that it was released accidentally, the virus spread globally in a day, going as far as infecting Pentagon machines. It is also the reason for the creation of laws against viruses.

Most Catastrophic Computer Viruses of All Time - ILOVEYOU