If you are:
- Running Windows 8.1 or 8.1 Pro
- Trying to log into Games for Windows Live Marketplace
because you have a game that requires it (such as GTA IV), then before you will be allowed to log in, you need to make sure the account you are using on Windows 8.1 is connected to the Microsoft/XBOX Live account you are attempting to log into on the Games For Windows Live Marketplace application.
If your account is not linked up with your Microsoft account, you’ll get some nifty authentication errors attempting to log in.
Microsoft, please address this!