The DirectX redistributables are installed together with the DirectX SDK so you can find them on your own machine as well. (Supposing that you didn't exclude that option during the DSK installation.)
To run your game on another machine, you need to install the DirectX redistributables plus the Visual Studio redistributables.
Please read through this thread for more information:
http://forum.thegamecreators.com/?m=forum_view&t=162417&b=22
Instead of using the DirectX redistributables, you can also try running the DirectX web installer on your friend's machine, which will hopefully update only the required components of DirectX. You will still need to install the Visual Studio redistributables separately.
http://www.microsoft.com/downloads/en/details.aspx?familyid=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en