P4P regardless they all use the same driver - LATEST
ADI1888 SoundMAX Audio Driver version 5.12.01.3630 WHQL driver
Go to http://support.asus.com.tw, download in top menu, select product "motherboard" select series "socket 478" choose your motherboard (p4p800 should do) click Search, Select OS (xp)
Why are you installing Realtek drivers?
Same error as before... Driver not found! Reboot...