X-Fi sound card cannot be configured properly. As soon as the sound card is enabled in Windows, it starts producing crackling noise unless the driver is removed and reinstalling doesn't seem to help, either. I had no trouble using it on XP Professional and 32-bit Vista Enterprise. When I first installed 64-bit Server 2008, the sound card seemed to work properly, but I had other issues with other hardware/software. I guess this is a lose-lose situation.