In Professional version, you can edit the corresponding resident task. By default, it has "Interractive selection" for infected e-mail - but if you wish, you can replace it e.g. by "Delete". (Though of course, it applies to all infected e-mails, not only e.g. Win32:Swen ones).
As for the versions: the free Home version has the Simple User Interface only; you are required to register on our pages and you'll get (for free, only by submitting the form) your serial number.
You can also install the demo version that is "Professional" with a trial period; don't know which is your case.