Sorry I didn't update this post. By the time I had gotten it fixed, I had forgotten that I even posted a question.
The problem now is that It's been about 6 months, and I remember deleting one of the .configs in App_Data\Sitefinity\Configuration, but not which one. It might have been something like ContentView.config.
Obviously make sure you back everything up before you start deleting stuff, and sorry I can't be more help. If you do manage to fix it, or if this advice is completely wrong, could you update this post?