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Have you applied the 1.3 patch? If so, or if that doesn't help:

Please run DXDIAG, Save All Info, and post dxdiag.txt here (first delete everything after the Sound Devices section so it will fit). Also post your Rome/settings.txt and Rome/logs/system.log files. Note that if you use Vista and have installed the game in the suggested folder c:\Program Files\Paradox Interactive\Rome, the active versions of these last two files will have been redirected by Vista to a non-system directory, like c:\users\[name]\appdata\local\virtualstore\Program Files\Paradox Interactive\Rome\. You may have to search your C: drive for them.