I got caught by a Trojan horse trap from Face Book

By clicking a link from a trusted user (I thought) but it turns out it was the trojan virus she had clicked on that sent the email under her name. UH OH!
Even though my virus program has trapped it time and again it is still popping up an Internet Explorer page, trapped by AVG each time and a porn video site that I in NO WAY want to chat with.  AARRGH! 
BE CAREFUL!