Hi,
Zach, and welcome to the forums.
You might try
Guru3D - Driver Sweeper to remove your currently installed drivers, and then try installing the latest version only....
- Download the Driver Sweeper package, and install it.
- Reboot into Safe Mode
- Run Driver Sweeper and select teh Realtek Audio drivers for removal.
- Remove them
- Reboot and allow to normally boot into Vista
- Install the R1.96 drivers.
See if this method allows for hte driver to work correctly.