I was just on what seemed to be a reputable website, when it suddenly popped up something which appeared to be due to a virus.. I panicked, but I remember it mentioned banking and facebook details.. I think it said something about the government as well.. It seemed like it mentioned my IP and ISP also.. I'd like to see it again for details, but I'm afraid to visit that website again. It wouldn't let me close my browser, or even shut down the mac.. I just held the power button, and then powered it up again, and it appears to be fine. I think it was just the popup notification window that prevented it.. So, could I have a virus? How can I tell if there are any issues or if someone is viewing my activity? Please help..