First you need have Forge Installed.

Download the Install on your computer.

For Windows, just run the installer and it will add a new Version to your client.

When you relaunch your client, you will need to change your profile to use: 1.7.2-Forge10.12.0.1019

Now for the Shaders.
There are two parts to this, first you need to ShadersModCore.

You put that into the Mods folder of your .minecraft folder.
Start your minecraft client, so it loads and creates its folders.

Then you need the actual shaders, download them.

This file goes into the ShaderPacks folder under .minecraft in your AppData folder.

That should be it for the install, now start your minecraft client again.

Make sure you have 1.7.2-Forge chosen as your Minecraft version.

For some of the links visit the post here