OK, ITS ABOUT TIME.
This worked for me, it may work for you, idc honestly...
Go to C://Nexon/Combat Arms or whatever your pathway is
Make a new folder inside the nexon folder called "Nexon"
Drag and drop your Combat Arms folder into the new Nexon folder
Your new pathway should be:
C://Nexon/Nexon/Combat arms
MAKE NO CHANGES TO THE SHORTCUT AND IT SHOULD START ENGINE.EXE
IT DID FOR ME
This should stop the "COMBAT ARMS HAS STOPPED WORKING" error message after clicking "Game Start" on CA.exe
BIG BIG EDIT: WORKED FOR ME, AND BOTH MY BROTHERS
I'm excited, lol...