Do not fall prey to the latest Trojan doing the rounds on the interwebs!
The Yantoo Trojan is most definitely not new, as it's been doing to rounds since the beginning of the year.
The reason why it is being treated as a Trojan and not a Virus is because it poses as a media player browser plugin, reporting that it will play almost all media file types for you, and then obviously doesn't.
Luckily, it is not a destructive Trojan, but merely Adware-related.
Once installed, it splashes ads over your favourite websites.