If you've already tried installing the Windows XP Service Pack 3 Release Candidate v3264 with a High Definition Audio (HDA) device in your computer, I'll bet you have encountered problems with the audio drivers as I did.
"When you try installing the KB888111 which works for SP1 and SP2, it will not work for Service Pack 3, at least for the current SP3 RC v3264. Instead, you will be prompted with a message saying that the current service pack installed is newer than the fix you are trying to apply. Even the older KB835221 does not work."
More info at TechARP.