There are several kinds of Trojans and each may have a different effect on your machine. Trojans are mostly recognized by most up do date virus scanners, however once the Trojan is executed, it will make several changes to your registry and configuration which are not easily detected by virus scanners and can't be cleaned automatically. By identifying the class of the Trojan you are infected with and visiting the web site of your favourite Virus Scanner, you can find step by step instruction as how to clean your registry entries and other configuration changes made to your machine. however some Trojans can't be cleaned with anything less than a clean format. So remember being pro active and running a good virus scanner and firewall would always be an easier task than cleaning a virus or Trojan.
by Wildcatboy edited by DrTCP