Trojan horse virus has been a common computer threat. This virus makes the user think that it is beneficial in order to effect the computer application thus it is quite difficult to remove. The virus hides in useful files then after it has been completely installed in the system it begins to infect the files in the computer.

The Trojan horse virus steals important files from the computer then sends them to the internet servers of the developer of this virus thus giving him power to control the computer. This virus causes the computer to become slow. Windows also pop up unexpectedly even when the user is not performing any activity. The final result is a computer crash.

This virus spreads primarily through email attachments, chat software like Yahoo Messenger or Skype. It also sends itself to the people who are in the address book of a user whose computer has been infected.