Read the posts between pages 15 through 25, or click the technical support link at the bottom of the trainer. This has been covered extensively.
Game's crashing for virtually everyone, may or may not be trainer. Make sure you had all the options turned off before moving on, etc.
Numpad 2: Unlimited Movement activated
Numpad 2 again: Unlimited Movement deactivated
Same thing for others options
Thx Cal for your work