Did you try uninstalling it through the Device Manager? Right click the Realtek one in the pic you posted. Uninstall and check the box to remove the driver. That should disallow it from autoinstalling via Win Update.
edit: Actually, I think that will just uninstall it. You may need to also download this tool directly from Microsoft which prevents select updates or drivers from downloading/autoinstalling.
This is the version im using and i have everything as i did like windows 8
login : spcust
password : hwwk758z