the first thing that you have to do is extract the game befor you do any cheat except for a ammo hack or a walllhack/speedhack...ther are fourms for you to read that will teach you how to do it.also if you dont feel like doing the work ther are a few hack programs that you can download. but if you ask me you should extract the game cause ther are many posts on weapon mods and being invisable etc...