I think it is very difficult to distinguish the real anti-virus program from the fake one, at least at first sight. It was a lucky chance that I didn't buy one of those "rogues" as they call them. I don't know how "Smart Fortress" got inside my computer – I read they can enter a PC without the user's knowledge, and still – I don't usually visit suspicious websites. Anyway, when I saw this program on my desktop, I really believed it was genuine. It does have all the needed buttons and tabs for an anti-virus application, I guess. It found many viruses in my computer and since I didn't use to have an anti-virus program, I didn't ask myself how this one got installed, but rather how to get rid of the viruses. I am lucky I got this rogue on my Pc, because it made me look for an efficient anti-virus program to buy.