I've just got one of these devices from Maplins, on special offer £20.00 and have installed it on my laptop. OS is win 2000 SP3 with directX 8.1 installed. None of the DVD players I have (DVD express, came with the computer, winDVD 4.1 or PowerDVD, both trial versions will output Dolby Digital via the device. The SPDIF option is greyed out in WinDVD. There doesn't seem to be an option for turning SPDIF output on for the USB audio device in device manager. Any ideas?