Locate your Guild Wars 2 directory. For this guide, this directory is C:\Gamez\GW2
Download SweetFX from HERE. While it is downloaded, learn more about the software HERE and HERE
Once the download is complete, locate it and open it in an extraction program. I am using 7zip.
Download SweetFX Configurator HERE. While it is downloaded, learn more about the software HERE and HERE. This program is to further tweak any defaulted settings. You will not be using this right away if you like the results of the SweetFX_settings.txt that I am supplying below.
Within 7zip, double click the directory to see the files inside. Highlight the two files highlighted below and click Extract.
To use my personal settings, please download the file from HERE. Once downloaded, rename the file SweetFX_settings.txt and overwrite the file that currently exists in your GW2 directory.
NOTE: If you get an error when launching the game, you'll most probably need to install the full DirectX 9 suite from Microsoft HERE. If you further have problems with launching the game, another possibly problem could be that you lack administrative access. Right click your gw2.exe file and choose Run as Administrator. If that doesn't work, than to revert back to the state you had before, all you need to do is the new files we've copied into your GW2 directory so that the end result looks like this: