On the graphic options there should be an option 4/3 or 16/9.... or wide screen. Can't remember right now. But it should be there.
Unselect wide screen it if it is selected. Choose 4/3 if that is available
Also, another Idea that comes to mind, concerning your situation is to choose the resolution your monitor runs at. If for example you work on a 1024*768 resolution capable monitor like me, and for some reason Rome Total War has 1280*768 or 1280*1024 resolution selected, you would see what you are seeing.
report back if problems persist, or there is something we can help with. Good Luck!
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