Hack not injecting?

Aright so my problem is that i inject the hack but then it doesn't work, it injects successfully into Engine.exe and whether its a hotkey or menu hack, nothing happens.

I tried about 5 different hacks

and many different injectors:
Faith Injector
PerX
Black & red Dragon injectors
And this other one user made.

I run windows 7/64 bit
My antivirus and firewall are not blocking it,
and i run it as admin,

HELP PLEASE

Try Black Dragon injector.

Download Combat Arms again?

Than I have no idea man. Sorry.