If you try and run the injector, and you get this

,
and you get a blank box with only one option that is 'OK', causing CF to crash. I found a simple solution.
As soon as you run the injector, open crossfire. When this

comes up,
quickly drag it away and click 'OK' on the 'Hack Made By Canadian Assassin' which normally would have been hidden underneath.
This should fix your problem of the game crashing
OTHER TIPS:
I use PerX injector, i find this the most reliable and easiest to use.
Keep an eye out for hack updates frequently.
And most importantly, have fun
