Hacks Wont Work Please Help

Hey guys i have a windows xp laptop and i play combat arms and was wondering why the hacks and injectors werent working for me. i download and injector and a dll. hack but when i start combat arms it says that the combat arms engine.exe hasnt started but it plainly has. idk whats going on and i have hacked before on a diff pc and never had this problem. i was just hoping someone had a soulution.