the game will not let me on, what should I do???

edited April 2011 in Game Support
I have just installed Back to the future the game on my pc, but when i tried to open it, an error keeps coming up saying :
'cannot find d3dx9_41.dll, therefore, the application has failed to start. Re-installing the application may help fix this problem.'
but I don't know how to. What should I do to solve thsi problem???

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