Im on my second character now and i'm going through the dark brother hood missions. I am stuck on the mission where you are supposed to get Shadowmere from the black pool. I go out side to receive her but she never comes out of the black pool. I have re load the patches multiple times and it still never shows. I have started the mission over multiple times. Please help.

I'm assuming here, so correct me if I'm wrong, but by "reloading the patches" do you mean reloading previous saves or actually reinstalling the software patches you've downloaded? If you haven't tried reverting to a previous save, I would try that. If you have, or if you do and it doesn't work, you might be stuck. I can't think of any other way to fix it, but I can tell you that reinstalling the patches (if that's what you're doing) would have little, if any, effect on this issue.