I even installed 8.1 RTM on my 8, then I got black screens during installation, had to use the power button to set my system at sleep mode, then rewake it by the power button, so I have Visuals again, but then I did want to update my graphical driver, got an error, system did a restart and got stuck at the password screen (I entered password, I saw welcome, then a grey screen, then password screen again, and on and on...)
So reinstalled everything again, but now the Windows 8 key is seen as a upgrade key and no longer as a full Retail key... (even had a problem after the format, my disc no longer wanted to create a partition, but solved this), I could install with my windows 8 key, but activation didn't work, so installed Win8 again on top of Win8 and everything runs fine again.