Turn off your AV when installing, and immediately turn it back on after. The virus warning springs up because during install of the Predator files, an .exe file gets run at the same time. This .exe file is not a virus but a little animation of the predator. I have had this file on my computer for years and am not infected. I virus scan regularly, update my virus scanner every day, and run ad-aware daily. There is no virus in it. Scan your system after and the only warning should be the original zip file (like you get anyway).