Rocketfish... alright, don't know that brand, gotta LIU real quick
So, sound card is healthy, as far as I understand? First try out ONLY WLAN card in the same slot where sound card is sitting now. If it works fine alone, try whatever card is less valuable/is on warranty out in different PCI slots (IME, bad PCI slot can mess up a card).
Are both cards recognized in Device Manager? Drivers installed?