took some time, but it seems like Creative has finally gotten its act together and fixed the hardware Dolby Digital and DTS decoding for its X-Fi cards. Creative has also added DVD Audio playback, a feature which worked under Windows XP but not Vista.
It's disappointing that it has taken Creative nearly two years to add this functionality in the drivers and the company has been very slow at releasing new drivers for its X-Fi range of card on a whole. The last driver update was back in March and that fixed issues with PCs having 4GB of RAM, among other things.
The new driver also addresses an issue that could cause your system to crash in the Audio Creation mode. Apart from this, there seems to be little else that's new in this driver release. The driver is intended for all X-Fi cards except the X-Fi Xtreme Audio.
You can download it here