I don't really know. Having injection.exe displaying waiting for game start after injection successful is a normal behaviour since the injector will look for any other game process without the dll injected. This also means that the dll is really injected otherwise it will enter in a injection loop. Based on this, I really don't see why you have such a strange behaviour. Try to kill aeria ingnite process from the task manager, and then directly start the launcher from the game install folder (launcher.exe). Also try to deactivate temporarly your antivirus.
Which client version are you using ?
Which client version are you using ?