omfg i found the problem,
i dont know why but my fallout3 exe was named
Fallout3ng.exe, i renamed it to fallout3.exe and the trainer works again^^
how odd, must have been done somehow, patch or a mis-select when renaming another file. glad you got it fixed. there is nothing wrong with the trainer, occasional blip/CTD with the weapon repair option, but otherwise fine.
game is a bit unstable, after Nvidia driver update to 185 (well for me anyway). and thats with no trainer running.