I have bought an alienware laptop about a year ago, and quickly installed my steam games, which work fine. Recently I found my old physical games (like Spore, World of Warcraft, The Sims 3, etc.). When I try to put them in and play, they just appear as blank discs, as if I had just put in a blank dvd. Maybe it's because I got the computer from America and the games are European (I live in Portugal, to be more specific). Someone please help