I think its either because your anti virus is blocking it or because you need to update to .net framework version 4.
This might not be the case, because I resently learned that the trainer doesn't work as well on 64 bit systems as it is supposed to. I am not going to fix the issues, so I am afraid you will have to live without this trainer.
Hey dood neither 1.2 or 1.7 of your trainers work for me, I even tried putting the trainer in the same directory as my Mw2, i have the legit copy of mw2 from steam and it's up to date, the trainer detects mw2 but no changes are made after i tick the options,
Ive tried doing it in the order you said, and other variations however it still dosnt work