1. Use the original Engine.exe
2. right click engine.exe>properties>campatibility>and check the box that says compatibility for xp service pack 2
3. Do the same with the hack provided in the link above
4. Then Run as Admin for the hack
5. now don't press ok yet in the hack.
6. open combat arms (not as admin) and wait till when you have to press gamestart. (don't press gamestart yet though)
7. press ok on the hack and then press gamestart.
8. you will get engine.exe error which you should and ignore it don't close it...