Excel Opens Completely Blank/No Menus

I recently had difficulty trying to open a file in Excel... it did the thing where, if I clicked a desktop shortcut of the file, Excel would open, but no file would appear (note: only files downloaded from a specific website, otherwise Excel was functioning properly). It would either open to a blank workbook or blank screen. I googled and tried a few things... some DDE setting among other things, none of which worked. I then followed the instructions I saw on another excel forum for the regserver/unregserver stuff. Not only did it not fix the initial problem, but now every single menu is gone from excel. I have no file menu. I have no formatting. I have no ribbon. I have absolutely nothing. I've tried all the function keys, with alt, with shift, seemingly every combo I could think of. Nothing! What do I do!? (I am using office 2010).

*Edit: I forgot to mention I also ran a repair before posting. That did nothing.