I figured this one out on my own. The problem you have is that you are stuck on the Master of Horses quest correct?
If so, go back to Haven, go to the stables located next to the Black Smith where you craft armor and weapons.
Selected the First HORSE, the Ferelden something rather, once it has the checkmark beside it, leave the menu and return to the quest for Master of Horses and presto it should be there.
If you do this and you experience a black screen cause the horse you picked was invisible upon return, simply select a horse from a different category, leave the menu, once the horse appears reselect the stable and do what I said above, this should make the first basic horse appear and loop the problem.
