I couldn't find the solution here, so I thought I'd post a note including the keywords I was searching for for future reference.
The problem was easy to fix -- assign some resources to the audio codec and you get sound. Unfortunately, you had to do this after every reboot.
The permanent (so far) solution was almost as easy.
The fix was to flash the bios from 97h4147 to IBET54WW (1.22 latest available).
Symptoms:I. Summary of changes
version 1.22 - IBET54WW
* (New) Support for Microsoft Windows XP
Crystal WDM Audio Codec Code 10 (in use error when enabled by TP utility)
Communications Port (COM1) assigned resources used by ir port
Once I flashed the bios and initialized the computer WinXP discovered all hardware properly except for the wireless adaptor which had to be uninstalled and rediscovered.
The model is: 2645-51u





