I installed it and then restarted my computer, I have no idea if It will help but It's worth a try. Besides I feel like I'm fixing it so I'm not freaking out. Now it tells me there is a serious error and Microsoft doesn't want to or can't do anything about it.
My only consolation is i saw the footage of Sam Frodo, and Gollum yesterday on the official site. It made me cry.
It's only 10 days till the movie comes out anyway. I guess I'll have to wait.