Support Information:
Device Type: Sound Card
Manufacturer: Unitek
Model: PCI Sound Card CMI8738/C3DX
Interface: PCI / ISA
Operating System: Windows XP Professional x64
Age of Device: < 6 months old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=&qa5=19&qa7=1501&dp=0.5&qm0=PCI+Sound+Card+CMI8738%2FC3DX&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Unitek+Sound+Card+Unitek+PCI+Sound+Card+CMI8738% 2FC3DX+Windows+XP+Professional+x64+)

X64 drivers are not posted on the C-Media (CMI8738 chipset) website:

http://www.cmedia.com.tw/?q=en/driver

You may need to contact your vendor to see if X64 drivers are available.