I need someone familiar with Sound Cards, particularly the Creative X-Fi Sound Blaster Fatal1ty series. I'm having multiple issues with it: I have a Logitech Z-5500 5.1 system- It supposedly has Dolby and DTC installed on it's control pod to decode things, Whenever I use Dolby or DTC encoding, I get no sound. If I change modes, I get no sound, I'm using an Optical cable, and 6 channel direct "Direct" option is there too. With direct, my back speakers act like back speakers, with Optical, my front and back play at the same time so I don't know if I'm getting true 5.1 Surround. EAX doesn't seem to work either. Really need some help, it's frustrating.

Optional Information:
Computer OS: Windows 7
Browser: Firefox

Already Tried:
I've reinstalled drivers (newest) almost 4 times over, Switched playback devices, tried different games, it's just not working.