USB Audio Driver Not Loaded

[Guest]

I am trying to install a USB cordless telephone on my computer running XPSP2.
The computer however will not recognize the USB audio device. The
manufacturer of the telephone says that XP drivers should automatically
detect the device.
I discovered that the USB audio driver has not been loaded.
It is not in the Windows/System32/Drivers directory but I found it in the
ServicePackFiles/i386 directory which I assume is a storage folder.
( I have the same problem on a laptop computer as well)

Why is the driver not loaded?
I am running on an Intel D845PESV Motherboard with onboard audio.

 

[Guest]

Is there anyone out that can help me?

Further information, I believe the problem is due to an older USB 2.0 webcam
that I installed earlier that used its own USBaudio driver (CSAUD.SYS) that
for some reason stopped XP from installing USBAUDIO.SYS.

How do I get the Microsoft audio driver installed?