Uninstall the drivers & software also in Add/remove Programmes, Remove from device manager.
Shut down machine and put card in another slot.
Make sure any onboard audio is dissabled if any.
start PC let windows find card click cancel go to the "windows update" site download them drivers.
This L-8738-6C who makes it ? CMI just do the Audio chip but the card is made by someone else is the L for Labtec ?.