Upgraded from XP to VISTA and sound card stopped working. Trying to obtain driver for SigmaTel HD Audio Sound Card

Support Information:
Device Type: Sound Card
Manufacturer: SigmaTel
Model: sound card
Interface: Firewire / 1394
Operating System: Windows Vista
Age of Device: < 1 year old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=1690&qa5=19&qa7=1801&dp=1&qm0=sound+card&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=SigmaTel+Sound+Card++sound+card+Windows+Vista+) | Research manufacturer SigmaTel (http://members.driverguide.com/index.php?action=getinfo&companyid=1690)

Sigmatel doesn't offer support to end users. That support must come from the vendor. What pc brand and model did this device come pre-installed in?

Some Dell perhaps?