[HELP] 'MW3 Was Not Found'

Hey guys, the problem is, when i open a trainer in MW3. And i try to change prestige and stuff, it says 'MW3 Was not found' meaning that i cant detect it, please help? I am running it in a fullscreen mode and i've opened MW3 Program, it can't detect it.
It's CommitedHail's Trainer .

Hell no. I am using the legit version bought from a retailer. I got it verified on steam. it's possible for me to get a VAC ban.