make sure you're using the correct version of game and trainer. try no-cd fix. disable antivirus. run as administrator, etc. there is nothing wrong with the trainer, you just need to determine the issue on your system.
www.cheathappens.com/trainer_troubleshooting.asp
I doubt very much if there are any issues with my system, but I did discover a major problem with the administrator (me). I never read all the trainer instructions completely!
First time that's happened.
Thanx