Win32.Vitro is quite dangerous trojan virus. Just like trojan Vundo and Zlob, Win32.Vitro can be obtained by visiting various noxious websites. Mainly, Win32.Vitro is promoted on websites that offer free online movies. In order to watch those movies visitor has to download certain video codec. However, it’s not a real video codec, but trojan Win32.Vitro. Once active, Win32.Vitro performs various misleading actions. It downloads and installs additional malware and spyware without user’s permission. What is more, it advertises rogue anti-spyware applications such as Antivirus 360 and System Protector. Win32.Vitro must be removed at earliest stage, because removal delay will cause even more damage to the system.