how to use normal maps / Black artifacts showing up ?

vex3d_22560

I've tried AoA's light set, but even with the DAZ default lighting, I'm getting black artifacts on my character after attempting to use normal maps ( I used photoshop's filter of normal map generation to get the normal map ) I have no bump maps set.

Any tips on how to use these? Or a thread that has info? My search-fu is very weak.