Help with injector

My friend who is right next to me got it working on his system, but it wont work on mine. I am stumped out of ideas, i just can't get the Cheetah Injector to work for crossfire. Anyone have any suggestions?

when using a cheetah injector or any kind of stealth injector set the option on normal mode.....
or better yet, try using omfg injector.............