as said in some posts and replies before. The Cheat Happens Trainer will not work for the German version of the game. At least that was the problem I had. See the German version is cut (meaning: you cannot shoot civilians or by-standers). I gueas the game itself has a sligthly different coding and tehrefore the game crashes if you use the trainer here.
I also knew that could happen before but simply forgot to buy a "interantional pegi version".
Well for me the "NO CD" didn't work out but I found a other trainer which worked for me (Retail Version). However it is not allowed to post links to trainers here.
I also don't know if I'm allowed to tell you via message box but you can try google.