Just bought Civ4. Seems to load fine. Can't play. It begins to load, then the screen goes black w/no sound. That's it. Windows Vista Home Premium. Intel Core 2 Duo cpu, 2.93GHz. 4 gm Ram, 64 bit OS. Intel G45 Express Chipset display adapter. How do I get it to run? I know just barely enough about the workings of a computer to not want to know any more. Already searched the threads and can't tell if any previous issues are similar, due to too complicated responses. Any answers in simple language?