I know this happens when textures or meshes are missing, V
tried verifying skyrim data via Steam V (that should work but it didn't obviously !!!)
tried deleting all files and redownloading them via Steam, X (it seems that didn't work either....)
Try it that way...
First do a standard uninstall. (Control Panel\All Control Panel Items\Programs and Features-> Uninstall The Elder Scrolls V: Skyrim)
Next, delete your skyrim folder under C:\Program Files (x86)\Steam\SteamApps\common\
Then delete your Skyrim directory under Documents\My Games (after backing up your save files, if you wish)
Then under C:\Users\[Your Username]\AppData\Local\ - Delete the Skyrim folder that is in it.
(You should enable to see the hidden files under windows to delete that folder.) HOW: (View - Options - Folder Options - View - Advanced Settings: Show hidden files, folders and drives)
Go to your Steam folder. Delete the folder named appcache. (Important)
Use Ccleaner after all this (http://www.filehippo.com/download_ccleaner), Go to the Registry tab and hit -
In the Options tab go to Monitoring and uncheck: Enable System Monitoring and Enable active Monitoring
Reboot your computer (Important)
Then install your game again, from scratch. !!!!
*** You don't need to uninstall Steam. ***