Theres a problem..

When i inject a hack into combat arms, that hack only works once until i restart my computer. what happens is that when i would try the hack again the second time, a black screen would come up. it even does it without the hack!!!!!

Well, this has happened to me b4. The problem was my hard drive. I suggest you reformat your pc coz it may have corrupted files. I first suggest you reinstall the game. If that doesn't work (which it didn't for me) then just reformat Hope I helped.

try CCleaner to repair.. if that dont work u gotta reformat pc