Some Game Trainers are sometimes reported to be a Virus or Trojan, the most common is a keylogger called HotKeysHook or the file has been packed/protected with VMProtect or Themida and is recognized as Win32/Packed.VMProtect or Win32/Packed.Themida.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! Also, to get custom textures/models/sounds to work you will need to go to : My Documents > My Games > Fallout 3. : STEAM (Denovu DRM + 3rd-Party EULA) (Digital Download) Game or Patch Questions? Visit FileForums