Steam is a true wound

I ordered this game because I really liked the previous album Oblivion. Unfortunately, during installation, it launches steam and settled. And surprise when I saw that he had installed on the steam account of my son without asking the password. When I launched the game, steam asked the steam password and my son does not remember most it's been months since he no longer plays! I uninstall the game and reinstall it, taking care to create my own steam and then re-surprise, he replied that the key is duplicated. So I can not play it !!!
No Steam Support who replied to any of my emails. A true catastrophe that steam service and the game. No way to pay another. Never again will I buy Bethesda game.