Norton Anitvirus can usually get rid of a Trojan virus. However, the newer the virus, the less likely this is. To be sure, update the Norton Anitvirus before you tell it to eliminate the Trojan so that it has all necessary files to do the removal correctly.
Norton should remove any virus, but you could also try free antivirus programs such as AVG Free. Until the Trojan is removed, don't shop or bank online for safety.