Dell Inspiron 1525 - audio device on high definition audio bus driver missing

I was asked to downgrade a Dell Inspiron 1525 laptop to Windows XP from Vista. I downloaded and installed all the correct drivers from Dell support but there was one device which didn't seem to have a driver. I now have the solution:

Problem
Unidentified object in Device Manager – ‘audio device on high definition audio bus’ with yellow exclamation mark.

Solution
This actually belongs to the Video card and the driver can be found in:
C:\dell\drivers\R180043\HDMI (where R180043 is the video driver)

After installing the driver the device is correctly identified as ‘Intel® High Definition Audio HDMI’