Make sure you have installed the redist programs needed for Il2 BoB to run (DirectX, VC 2008 controls, DotNetFx 4.0 - they can all be found in IL2 BoB's install folder/redist), and that you actually rebooted your computer after installing them.
Also update your video and soundcard's drivers, disable antiviruses and eventually run steam in administrator mode.
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