Don't buy a windows. You will not be able to play W:ET unless you: 1) Download and install VMware fusion OR Parallels desktop 2) install a bootcamp with windows on your mac partition, only for w:ET so 50GB is more then enough. Else Snow leopard is an option, but it cannot work on the new MacBooks. You bought an amazing computer but it's not for game play. btw Slarty: what's a crossover ?