Difficult to tell how it got IN. Should Zonealarm have stopped it getting in? Or maybe it was in a mail. I usually delete spam without opening it, but sometimes I can't tell. I cetainly don't execute attachments.

Besides, I am using Netscape, not Outlook.

Yes, my C drive is shared for use on our network at home, but I only connect to the net by dial-up. Thought the firewall would deal with that.