Yes, my ISP has a built in security bundle that I use, which includes a spam filter and virus scanner.
I use Outlook Express for my email, and the ISP has automatically created a message rule in OE that flags the spam as red, downloading only the message text but deleting any virus attachments.
I changed that message rule to delete all spam right off the server, and then someone said that might not be a good idea, since some legit email (newsletters etc) might not get through, so I changed it back. At last count I have about 45 spam emails in 27 hours.
I'm considering sending a BCC email to everyone in my address book and seeing if anyone has had an problems, including a link for Symantec's removal tool maybe. There are a couple of peeps in my address book (and me in theirs) who are net-newbs, so who knows what they might have opened up.
I guess what I'm not sure of, is why I continue to be hit over and over? Is it because their machine is still infected, or could there be another cause?