D3D9?

well i wanted to inject a hack in combat arms EU but it said cannot load d3d9 try to re-install it.
but idk even what d3d9 is...
can som1 help me?
i tryd about 4 hacks and they all said it

d3dx9_43.dll free download - DLL-files.com

Put it in your system32 folder (if Windows XP - C:\WINDOWS\system32) and your Combat Arms folder.

Also, next time specify the full name of the file that the error says you're missing. I am not even sure if d3dx9_43.dll is the file you're missing...