NO, do not re-install, it will not change anything.
I see a blender node in the hair specular.
That might be giving you the trouble. => Specular

I have a hair of my own creation. (Dynamic)
The hair is beautifull, but ONLY in certain light conditions.

When I change the light, that same fantastic hair I love so much, turns out horrible in the most UGLY way.
I know it is a specular problem with my hair but have not bothered to check-correct yet.

I position the light to get a good render.
 

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!