Yeah, the same thing happened to me, there's a patch download for the game, all you have to do is download it, run it and it will automatically install the patch, just make sure when it asks you where it is going to install that it has the right file location. Empireatwar.gamefront.com
PS. Don't worry about it saying "Vista" as i also installed it on my Windows 7 and had no drama.
Eredin
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