As the title says.

I bought Skyrim on steam on release, i played it then and later added mods, no problems a few CTd that were not frequent, i stopped playing.

Since ive reinstalled skyrim, added mods, i cant even get past the Creation screen, Cart ride is fine, Creating character fine, asoon as my character goes to get beheaded, when alduin lands on the tower, right around then i CTD, ive tried the sound fix, ive tried removing all mods and starting ive even resintalled the game.

help?