Smart Fortress tried to make me buy it, but I was prepared this time. Last month I bought one of these fake anti-virus programs and after that discovered it is useless. The full version was nothing different than the trial one and it just continued to show fake warnings and scans. I just wasted my money and then I had to buy a real anti-virus program to remove the fake one. As expected, I couldn't take my money back (that I spent on the virus). Two days ago, when Smart Fortress appeared on my computer, I already knew what to expect. Its alerts and scans didn't scare me and I didn't go for its "full version". I most eagerly recommend you to choose a real anti-virus carefully and buy one, so that it can remove parasites like Smart Fortress, which make you give your money to hackers.