E-Mail Worm? Canadian Pharmacy Ad

I received an e-mail from a friend and in the body was very simply a web address which I clicked on (and shouldn't have).  It took me to a web site for an on-line Canadian Pharmacy.

I immediately deleted the e-mail and emptied my trash and I ran a virus scan but I'm being

told that it's a worm that will send an e-mail to everyone in my address book in a week or two. I guess I'm not quite sure what to do next or even if I was given correct information.

If it is a worm wouldn't my Norton Antivirus remove it?  Thank-you.