Support Information:
Device Type: Sound Card
Manufacturer: Microsoft
Model: mpu-401
Interface: Parallel Port
Operating System: Windows XP Home
Age of Device: < 2 years old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=667&qa5=19&qa7=1500&dp=2&qm0=mpu-401&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Microsoft+Sound+Card++mpu-401+Windows+XP+Home+) | Research manufacturer Microsoft (http://members.driverguide.com/index.php?action=getinfo&companyid=667)

mpu-401 is not sound card model nor a sound card chip. Please read it's meaning here:

http://en.wikipedia.org/wiki/MPU-401

Sound chips bear name like Cmedia, Realtek, ADI SoundMax, Via, and ADT/Sigmatel. And I've never seen or heard of a sound card with a parallel port interface. You must have the only one in existence.