I bought Grand theft auto IV: Complete edition and wanted to play Episodes from Liberty city. It says i have to sign into Windows live to save my game. When i enter my email and password, it asks me for a product code. Since Steam provides you with key you can use, i just entered that in but it says my key wasn't valid. There's a button that says ''I need a product key'' When i press on that it just takes me to the Xbox homepage. Someone help me please.