Uninstall (do not simply disable, the files need to be gone from the Data directory) any and all mods, script extenders, third-party add-ons, and so forth and start a new game.
If it works, test your save WITHOUT reinstalling the stuff above. See if it works.
If it does work in both cases, it's a mod issue and goes here: http://www.gamesas.com/forum/183-skyrim-mods/