On that link I sent you there are fixes. I run a valid Windows, so it let me install. If the Genuine Validation Tool is already installed the validation is much smoother.
EDIT - a close colleague of mine just installed it, but needed all the little tools on ze link. I didn't need any, but I took those steps long ago in other shapes and forms.
It's an incredible build, still havn't gotten through all the new toys to play with. CTRL+Q does something very very interesting... the fonts are really odd ... smoother or something.