Running Windows 7 on my XPS 8500 and decided to ditch integrated audio for an Asus Xonar DSX PCIe sound card. The instructions clearly recommend disabling integrated audio in bios first, but I insisted on disregarding. Inserted sound card, then installed driver CD. Wouldn't recognize sound card. Soooo, I disabled integrated audio in bios and reinstalled the driver CD. Magically, the Xonar DSX worked like a charm. Lesson learned!