1. Since installing the drivers in the right order is required. Did you install the motherboard driver first?
2. On some boards/machines you must install the MS UAA (google MSUAA or MS UAA to learn about that) after the motherboard driver and before the audio driver.
I never found any PC Wizard to help. I use the service tag to get the right drivers from dell.com
I just reformatted my hard drive and reinstalled Windows XP on my unmodified Dell 530. I got everything working except the audio. I tried installing the Realtek driver (R180772.exe released 9/22/2008) from Dell and still no audio. I ran PC Wizard and it said I have an Intel ICH9 family audio controller. So I downloaded and installed the driver for that. Still no audio. In Device Manager, it shows a big yellow ?-mark for audio. Any suggestions? Thank you for any help you can give me on this problem.