You need the default shaders for patch 1.0.4.0 otherwhise the graphic mod won't work.
Install this if your game looks noisy, bright or simply not like on my screenshots at all.

Installation:
Go inside the "Install" folder and put the "shaders" folder inside "GTAIV/Common" and replace the existing shaders
folder with the new one and replace all files.

WARNING:
This works for patch 1.0.4.0 only. Don't install these shaders with another patch!