Really need help badly.

When I try start ca with my hack or even open my injector i get
this application has failed to start because d3dx9_42.dll was not found please help

then closes my injector

Well... Their is a help section for a reason

Moved.

Download d3dx9_42.dll. I'm pretty sure their was a thread made less then a day ago containing this .dll.

You need to download d3dx9_42.dll.
You can download it from here. DLL-files.com - Download all your missing dll-files.

After downloading it place it in your Combat Arms folder.