My understanding of that Klez virus is that it gets into your address book and other history and picks one name out to send an infected file to another name. So, If you get an infected file from Early-S-man for example, this doesnt neccesarily mean that he sent the email or that he is infected. There are several free anti-klez programs out there. I manage to get infected every month or so without opening any attatchments.....just have to keep up on it. I got my anti-klez program
www.bitdefender.com and it works great.