Since it's a realtek, don't most of those require a very specific install order of XP, motherboard drivers, MSUAA then and only then the audio driver?
I find many forget to use their install plan and end up with no sound.
I have reinstalled in my Windows XP machine. After it is re-isntalled the audio in my machine has failed.
1. I have installed all the device drivers in my mother board.
2. The Realtek Sound driver is also installed.
Sound is working when I test the surround settings test in my RealTek program, but unable to play any audio, tried playing both in my local machine and from the internet.