first, go download portal. it's a lot easier.
make a folder on your desktop, and put any hacks you wish to use inside that folder. put another folder inside that folder and move any hacks you're not using into that folder. then you just double click on portal and it injects your hack. if you get a .dll error, you go download that .dll file and put it in the combat arms folder. then all you have to do is press insert while you're in-game and pick which hacks you want to use.