FYI SMAA works too and doesnt blur everything as much because it only works on edges.
I couldnt get the newer FXAA to work in DX10 (the old one does though) so I guess it doesnt work unless your using DX9, where as this SMAA works in any DX9/10/11 version.
Not sure if both were working at the same time but I was also able to start with both SMAA and the older FXAA installed at the same time.
http://mrhaandi.blogspot.com/p/injectsmaa.html