Can't start Civ IV BTS because of runtime error

[Jesrin]

I own the Steam version of Civilization IV: Beyond the Sword and haven't had any technical trouble since purchasing it. However, yesterday I suddenly got an error that has been preventing me from starting the game. The error reads as uch:

Microsoft Visual C++ Runtime Library

Program:....IV Beyond the Sword\beyond the sword\Civ4BeyondSword.exe

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

I've tried uninstalling and reinstalling the C++ libraries in addition to updating my graphics drivers and reinstalling the game itself, but haven't had any luck so far. Anyone have any ideas?

Thanks.