Crashing issue after installing the Creation Kit.

[IsharaMeradin]

Looks like maybe your STRINGS file is missing or was adjusted by a mod using pre 1.8 data.

 

I don't have Dawnguard tho so I can't be 100% certain.

[Shadeling]

The SkyrimEditor.ini needs to be tweaked a bit. I downloaded the one here: http://skyrim.nexusmods.com/mods/21741, and the CK loads fine now.