Hi, I am trying to play a game on my computer and after installation when I try to start it, it says following error:

The program can't start becasue d3dx9_41.dll is missing from your computer. Try reinstalling the program to fix the problem.

I have installed full game but still this error is coming. It never ask me to install anything else.

now how can I fix it ?

I am running windows 7 64 bit

This problem comes if your system is missing directx9 install and you are trying to run a game which need directx 9. You can download directx from here :
Download DirectX 9.0c (Jun 10) - Download - FileHippo.com

It is 96MB download and when you are done installing, this error should go away.

this file is available on internet you can google search it and save it in the games folder game will work properly.