I'll start by saying that I'm a mac dummy (amongst many other things.) I'm running MAC OS 10.6.8, if that makes a difference, and Firfeox for a browser. Yesterday my iMac started showing strange behavior. When I'm browsing Yahoo News I get a Norton Phishing warning with this as the offending link: http://www.facebook.com/plugins/login_button.php?size=large&l... I never go on Facebook. Also, when I access web sites for song lyrics and chords (I'm a guitar dummy too) my computer hangs up. I can't even shut it down. A Norton virus scan finds no viruses. What's going on here? Any help will be greatly appreciated.