I have the Dawngaurd Esm in Red, but I can play Dawngaurd. I am not sure why it is red?
Your crash issue might be solved by moving "Skyrim" and "Skyrim Prefs" found in C:\Users\Documents\My Games\Skyrim to a different folder.
Start a new Game and let the Game generate a new Skyrim and Skyrim Prefs for you.
Try and start with an unmodded game, then begin adding mods back one by one, or start removing mods in batches until Dawngaurd will play.