I only ever use Single Player mode in games. Pity this trainer does not work as I had no issues with the Crysis 2 trainer.
I can tell you i have just finished Battlefield 3 and beleive me i have had more crashes than a bumping car (Dodgems)at the fairground,but i struggled on and restarted the game and i eventually finished the game.
The last note is "The problem is with the GAME Battlefield 3 and NOT the Trainer" and thats a fact.The Trainer works Perrrfect.
BUT, I cannot even get the trainer to work!
The trainer for Dead Space 2 will not work either.
With Respect to you my friend if you cannot get the trainer to work,then the problem is on your machine,have you gone through the Trainer Troubleshooter?,do all that, then come back to us all.