This KB fix the problem with XP (even Vista) not finding Audio bus device when you install the new WDM-R183 Realtek HDA driver.
Install the fix(multilingual) and then install the R183 drivers again and the problem goes 100% away.
All info and KBfix for all OS:
http://geekswithblogs.net/lorint/archiv ... 81540.aspx
I hope it helped some with this problem.
Bimpan, Sweden