Do Not Use Two Sound Devices Simultaneously
If you have installed a PCI or USB sound card on your system (such as a Creative X-fi or Audigy sound card), please ensure that your motherboard's onboard sound card is disabled in the system BIOS. Having both installed may result in system instability - even if the secondary device is disabled in the Windows device manager. Please consult your motherboard's manual for instructions on editing BIOS settings.