The interface is "integrated" (not IDE). HP never shipped this desktop with Win7 x64 installed, hence they have no drivers posted for that OS. If you can provide the hardware id string (found in Device Manager, Properties, Details tab) I might be able to help. It (the sound device) may be listed under "Other Devices", if no driver has been installed.
Windows XP drivers are found here: http://h10025.www1.hp.com/ewfrf/wc/s...&lang=en&cc=us