Crashes are straight to the desktop with no lag, blue screen, or buzzing sound.

So was playing my Breton Mage and there's a 50% chance when I kill (or my summons, or my companion) a magic npc Skyrim crashes. Which means I have to save everytime I'm lucky and gamble each time I kill a magic npc.

Then I try and marry Aranea Lenith, but the second I schedule for the wedding.....Skyrim crashes.....

So I hop over to my Argonian Thief do a few companion quests but when handing in the first Wuuthrad peice (offically becoming a part of the Companions) it crashes when I finish the quest......

Then I tried my Orc Warrior and it crashed when I killed a vampire doing a Dawnstar quest.

I really have no idea where to begin with this. This was days after I had installed any mods and done various things with these characters with no problems.

Start by posting mod load order.

Skyrim

Update

Dawnguard

Beautiful Whiterun

Realistic Whiterun

Detailed Cities

Real Clouds

Better Magic

SkyUI

Deadly Dragons

Static Mesh Improvement

Static Mesh Improvement (Furniture Chest Snow Fix)

SFO - Expanded Diveristy

Skyrim Flora Overhaul

WATER

WATER Plants

Better Embers

Enhanced Lights and FX

ELFX Enhancer

ELFX Exteriors

ELFX Dawnguard

83 Williow's 101 HD Bugs

Cinematic Fire

UFO

AOF Detailed Mountians

TCG

First of all install Dawnguard unofficial patch: http://afkmods.iguanadons.net/index.php?/files/file/658-unofficial-dawnguard-patch/

Then see if you have any dirty entries or conflicts via BOSS with your mod's.

After that go here and do like the page describes: http://wretchedcalx.blogspot.gr/2012/04/broken-mods-papyrus-debugger-and-you.html