so I tested the bioshock trainer for steam 1.1 with fresh install.
what may be causing the problem is your antivirus because I had the same issue until I temporarily turned off my antivirus, which is AVG.
The trainer works fine with Windows 10 as well..
[Edited by maiklohse, 7/15/2016 3:00:03 AM]
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem