Make sure you download the correct trainer for your version number, you can see what version you're running on the main menu screen. Run the trainer as admin. Get rid of IE10 if you accidentally installed it in Win7, and follow the directions for fixing it that are in the support forum.
I just reinstalled the game a few days ago and the trainer works here.
In the end they will lay their freedom at our feet and say to us, 'Make us your slaves, but feed us.'