BLACK & WHITE now STUFFED on XP

I used to be able to play BACK AND WHITE, DUNE and
Klingon Academy on my XP PC, but when I installed Direct
X 9 from a new game, I lost these 3, and they will not
load. Does anyone know how I can un-install or rollback
direct x 9 to a previous version? I can not find anything
in XP that lets me do this or tells me how, and trying to
install them from a previous game is ignored. Direct X 9
remains in place.