In ALL cases this is a FALSE ALARM as NONE of the Game Trainers GCW contain known malicious code! More info in the PC Games FAQ! In most cases using a No-CD or Fixed EXE will solve this problem!
Some original games do not work when a certain application has been installed, like DAEMON Tools.
When this happens use the original EXE to play online, else you could find yourself banned from the game! Game or Patch Questions? Visit FileForums