No. The virus does NOT have to be inside myTrack computer. The virus scans the user's address book, as well as cached web pages (ones the user went to) for addresses. It then sends out emails with the virus to addresses it found, with FROM address faked, but also from the list. That means that if the person whose computer is infected had your email address and either the myTrack address in their address book or on one of the pages that they visited, the virus can send the email that looks like it came from one person to the other.