In case you have a noisy & bright image, a blackscreen at night, overall ingame blackscreen (Still ingame sound, hud, menus) or other visual related issues:

-ENB is probably not loading properly. Check if you've installed this ENB properly and if your anti virus tool blocks ENB's d3d9.dll file.

-It could be a broken shaders folder as well. Use original shaders from the optionals folder for needed shaders.
 Make sure to install shader files from main files again aferwards (Main Files Patch 1.X.X.X > common > shaders).
 If you use patch 7/8/EFLC make sure to install shader files from main files again (Main Files (Patch 7&8 and EFLC)/Main Files/common/shaders).

-In case you don't use an Nvidia GPU you can try the "AMD GPU Fix" from the "Troubleshooting & Support" folder.