|You need to list your complete system specs - board, CPU, RAM, etc. It's difficult to give advice when we have absolutely no idea what you're working with.|
Did you enter the BIOS & disable the onboard sound? Did you uninstall the onboard sound drivers? After installing the sound card, did you install the Creative drivers? Not sure about running 2 sound cards at the same time. Never had a need to & never encountered it on any systems I've ever worked on before.