The 1.3.5 trainer crashes for me also, before the game is even started. I upgraded my computer recently to a Dell XPS 8500 with Win 7 x64, a Core i7-3770, 16GB RAM, DX11 and AMD Radeon HD 7700. I don't have much re-installed yet besides the games and AV (Avast).
I turned off my antivirus, tried running as Administrator, tried various compatibility modes, and nothing seems to help.
I tested all my CheatHappens trainers, and the ones for Civ5, Dragon Age 2, Fallout NV and Gothic 4 also crash (have something in common?). The other 15 CH trainers work just fine, including Borderlands, Deus EX, Fable 3, Mass Effect 2, Saints Row 3, Witcher 2 and others.
OK, I uninstalled Avast, ran the trainers as admin and they still crashed. I went through my list of installed software and found the culprit. After uninstalling "Windows Essentials Media Codec Pack 4.0 [64-bit]", all my CH trainers now load just fine (without having to run as admin). The following web site is where I obtained the codec pack in case you'd like to debug. Guess I'll have to find a different one that works with all the trainers. Thank you for you help.
I feel bad for the poor bastards who run this website. Answering questions, day in and day out, that simply require a small portion of common sense and a desire to not go running to a forum thread to raise hell. Makes me pleased to give them money every year. They deserve it.