Believe it or not, some new Directsound games will not work with the new drivers, as they are compatible only with DirectSound3. The fix for this is to uninstall the 33.6 drivers and reinstall the 28.8 drivers. The 28.8 drivers will work with some Directsound games, regardless of the version. The sound quality is horrendous, but the game will still play.
For links to the 33.6 drivers, go here