When you re-installed did you delete all the FH folders? Also try to toggle between the Options ---> Video ---> Rendering Subsystem ---> Direct3D9 and OpenGL to see which might suit you the best. Also maybe don't have high texture detail, it's possible your computer can't handle that.
I hope you'll get it to work, if not be sure to post here again so we can try to help you~ ;3
Good luck~
// Shallow