The most costly computer infection in history is the Love Bug virus, which was released in 2000. A trojan horse is a sort of destructive code or program that, when implemented, reproduces by placing itself right into other computer programs, data documents, or the boot sector of the hard disk drive. Therefore, trojan horse can spread out throughout a network of computers and cause major damage.https://malwarezero.org/different-types-of-viruses-for-computers-a-beginners-guide/ When a computer system was infected, the virus would erase important files and spread itself to other computers. The Love Bug virus was eventually stopped by a team of anti-virus scientists who produced a vaccine that could safeguard computer systems from the virus.