On world of warcraft. I too was having issues with the 9b to 9c thing, but someone already posted a solution that worked for me. While replacing the .dlls of 9c with the 9b ones should have worked, for me it did not. I had to instead replace the .cab files of 9b with the newer 9c versions. Then when I ran it, it installed just fine and dxdiag confirmed I had 9c.
That solves the directx issue, but not the part where my computer's video card doesn't work with them (but thats not important to this thread).
On a semi-related note, manually changing the registry key of the version number DOES NOT WORK! It doesn't cause any harm but it don't work. Thats why running the 9c with 9b .dlls didn't work because it only changed the registry key. So my question is, what file/registry key tells the computer what version of direct x is installed? If we knew this, we could change it manually and avoid many problems. I'd experiment myself, but I'd rather let someone more experienced with regediting take care of it.
GAMES i've found with the 9c problem(which I was unable to play because of the glitch) are:
Sims 2
World of Warcraft <===DAMN IT!!! 2.5 GIG OF DLING AND CAN'T PLAY!
Starwars Battlefront
CrystalK
