1. Is your MineCraft the 1.7.10 version? 2. Do you consider your computer powerful enough to handle shaders mod? 3. Did you correctly extract the individual shaders from the shaders pack and put them in the shaderpacks folder? 4. Did you look in the GLSL forums for answers? 5. Did you installed the latest version of Forge for MineCraft 1.7.10?
Shaders mod works on Intel HD integrated graphics cards like Intel HD Graphics 3000.
Shaderpacks folder is in main MineCraft folder.
To install shader pack, drag shader pack .zip file to shaderpacks folder.
Make sure you have the latest video drivers installed on your computer.
Don't add optifine !! this is just prewiew version and it wont work with optifine ! And if you get bugs like this http://i.imgur.com/c7gmJh0.png dont worry its jus normal prewiew version it will be fixeed