A trojan is usually a tool used buy a script kittie to open a back door on your computer so they can remotly connect to your computer to try and steal personal inforemation (ie credit card numbers, phone numbers, names, addresses) THink about a trojan hourse, they wheeled it into the city then opened the door and suprise the enimies were in! This one was placed in my temporary interent files for internet explorer so i first cleared my files and cookies then I scaned my c drive with nod32 and it didnt pick it up again. I'd suggest doing the same if you clicked on the link.