Hi amsbestbuy,
To do this you will need to have UPnP rendering software installed on your PC. And this is immediately the problem: at the moment there is no commercial software available to do this.
You can try to use the Intel UPnP tools (development tools), but the problem there is that every time you restart the rendering program, you will have to install a new Media Adapter on your RC9800i.
Does anyone know a better solution?