I upgraded from W7 to W8 last week and have since watched movies and played music from my laptop via my Samsung LCD TV which is connected by optical cable to my 5.1 Samsung surround sound. All was working well in W7 however since the upgrade I've no longer got an option to play the sound through 5.1. Stereo is the only option. I have installed the sound drivers and I also has K-lite Mega Codec Pack and AC3 Filter. AC3 Filter has given me some options to overrule the windows settings but the sound does not feel natural. Why has the option to use 5.1 in W8 disappeared?