YOu need to download the correct version from the official website and for your Windows architecture and then make sure to use an Administrator account to install it. This will give you access to system resources and the software will be able to recognize the installed adapters.
However, after some more researching, it appears that NEWT has been successfully integrated into the Visual Studio.Net 2010 version. To be able to test the network adapter, that version has to be installed.