It's a fairly safe bet that any "virus warning" that says "Forward this to everyone in your address book" is a hoax
http://securityresponse.symantec.com...ivor.hoax.html
edit:
I guess, better safe than sorry.
I know your intentions were good, but these are very easy to verify - if you type "WTC survivor" into Google then most of the first page of hits refer to a hoax virus warning