I am stuck inside a dungeon, each time I go to leave the game will CTD. I have deactivated all my mods and used a new save game file and it will still CTD. Any help please ? I have over 200 hours on this character alone and would of liked the word that is within this dungeon.

The game will also crash when I am near this dungeon outside as well so it seems to be releated to this particular place for me.

Open up the command prompt (~) and type coc and then the name of an area preferably a smaller area like Rorikstead.

Also I've read that save files become bloated after awhile and your game can become stable I've noticed this on my characters with 100 hours of game-play +.
The Skyrim Crash Prevention and FPS Booster Mod on the Steam workshop may help

along with Possessive Corpses no more lazy zombies and shy nirnroots - Possessive Corpses on the nexus (Which is being a tit at the moment so i cannot link).

That is all I can offer.