Driver Sweeper can also help with uninstalling drivers. It's also free...http://www.phyxion.net/
Recommend removing the driver from the Safe mode (F8).
Download/install Driver Sweeper.
Reboot into the Safe mode (F8).
Run Driver Sweeper to remove the Realtek software.
Next open the Device Manager and Uninstall the sound device.
If you need directions on how to do that, just ask.