Several months ago i got an e-mail from someone i knew and it was some viagra ad. of course since it was from someone i knew, i opened it. then there was the viagra ad. he sent a message saying that he didn't send it, he didn't know how it happened and apologized. since then, somehow everyone in my address book is getting the same spam e-mail which i don't send. i have been offline for SIX WEEKS and it still gets sent out. what the hell is this shit and how can i stop this from happening? is this a virus? any helpful suggestions would be appreciated. thanks!