If you remove all mods, does the game run under stock trim?
I'm going to go look for the proggy I'm thinking of, but can't remember at this time, but with a stock game, you can run a verification of the install, and it might be able to tell you what's missing, if anything. Then you can do a search on your computer and in the "trashcan", and see if maybe you do have the file(s)...
Edit: Wow. It always helps to type the correct search terms... Glad the one here on the site is slightly forgiving...
SH Validator from TheDarkWraith
See what you see, if you see it... Good luck, and hopefully Good Future Hunting