I was making a new character today and all was well until I got into Helgen Keep in the tutorial. Walls, ceilings and floors were missing leaving giant blue spaces. There were also blue spaces where the imperials would normally walk over to the gate to open it, but now the imperials won't appear.

I've been installing a lot of mods recently but I uninstalled all my recent ones and made a new save that wasn't effected by the mods but I still got the blue spaces. It's pretty frustrating, does anyone know how to fix this?

Fixed the problem, I just had to reinstall the game and then reinstall all my mods.