I have an ASUS P5KC motherboard which has built in Realtek audio. I have however, been using a Soundblaster Audigy card also. I now wish to link up my pc to my Samsung soundsystem via optical cable. The Soundblaster card does not have optical output but the P5KC m-board does. I have tried removing the Soundblaster card and installed the relevant Realtek software, however the Realtek program does not show in Control Panel, Start menu, desktop, etc. once installed. None of the .exe files in the installation folder run either. Without the Realtek program I cannot switch between analogue and digital output. See posts 388-397 for more: http://www.avforums.com/forums/all-one-systems/754943-samsung-htz310r-home-cinema.html Many thanks in advance!