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Very often viruses are spotted in trainers. Most of them are not dangerous so there is no need to just delete them. Trainers are programs which hack into a game and gives the player more options. This is done by hacking the game. 
Whereas antiviruses are made to track files which either run forcefully or which hack into any files and damage them. So a trainers methods are similar to the methods of viruses. Usually almost all of the trainers which are reported as viruses are not at all viruses. There is no need to delete them and instead they can be removed from the antivirus scans and be used without any error. If you want to be sure that they are not viruses then download such files from secure sites which will be safe and guaranteed that the files are not viruses. So lets enjoy playing.......