Question details:

I reinstalled the audio driver for the computer again, but it still doesn't work. According to the Sounds, Speech, and Audio Devices tab, under Hardware, my Microsoft Kernel Audio Splitter, Microsoft Kernel Wave Audio Mixer, and my Microsoft WINMM WDM Audio Compatibility Driver are all missing.

Answer:

Try one of this possible solutions:

1. Try to install the audio driver again.
2. Reinstall your motherboard drivers.
3. Go to Sounds, Speech, and Audio Devices tab, under Hardware, right click on the components with exclamation mark and select update driver.
4. Repair your version of Windows XP.