Install the Microsoft Loopback Adapter
This network adapter is nice to test networking app without exposing them to your normal network. Screen shots are in German, the description is in English.
1. Start Administrator Command Line
Easiest way to do this is to press the Windows key and type
cmd. Instead of just typing enter type Ctrl+Shift+Enter.
2. Start the Windows Hardware Wizard
In the opened command prompt form 1. type