On newer versions of Windows, you may need to disable Driver Signature Enforcement to install this legacy software.
Download the WDM_A406.exe (or similar) package from a reputable archive site, as Realtek has moved these to their legacy repositories. draiver realtek ac97 4 06 skachat
A system reboot is mandatory for the driver to initialize correctly and for the Realtek Sound Manager to appear in your taskbar. Common Issues On newer versions of Windows, you may need