@Cardepils
1. Did you set "Analogue Output" as your default device in Windows?
2. Try this output configuration:
green -> front L+R
orange -> center | sub
black -> rear surround L+R
blue -> side surround L+R (instead "line in")
pink -> don't use "mic in" for sound output
3. Deactivate both effects -> [DTS Connect] and [DTS Ultra PC II].
4. If that still not function properly, then plz post your motherboard model.
5. Do you use 3 adapters from 3.5" jack to RCA (cinch) or what?
6. Which device gets the 7.1 signal (Logitech ???, AVR, ...)?