Can’t do anything in movie maker windows live 7

Hi there, everyone. I asked this question in the Movie Maker forums but they suggest that I try here and get a faster/better answer, so here I go. I have Movie Maker Live 7 and out of the blue last week, it started saying "Access Denied" when I tried to load/edit/save an old video OR even when I make a new one. I've ran it in administrator mode several times and I've even reinstalled it and I still got the error. I tried it again yesterday and I didn't get any errors, BUT, I can now no longer save or publish any videos I edit or make. I click on "save video" and can click on "for computer" or "for hd display" (both of which I've had no trouble doing in the past few months) but the window to save never pops up. Ever. I've waited for a good twenty minutes or so and nothing ever comes up. I need this thing to work badly and I'm at my wit's end honestly. Can anyone help me? Any help is appreciated.