No Cheats are working

I have a Problem, No Cheat that I will use is working.. CoD4 & MW2 Cheats not working if I inject it the Game is crashing..
For MW3 the Ycbrcr v2 Bot is also not working but I can Inject it! Kevin Trainer V2 is also not working (Not loading)..
How to Fix?

Don't listen to person above me,your right none of the cheats work and I basically just wasted my money on a dead game with no cheats. I may just ask my Dad to buy me a paid cheat for the game but other than that I may just refund my money.

Seriously? "wasted my money on a dead game with no cheats"??? games are not meant to play with cheats you know, kiddo. Play the game fair. Cheats are optional, not mandatory.

Every computer game is a cheat in itself, so cheats are mandatory indeed

:-)