If you are missing the Wireless Zero Configuration (in German: Konfigurationsfreie drahtlose Verbindung), you might have installed a D-Link driver.
To get the Windows tool back, there’s a nice manual at practicallynetworked.com:
- go to Start → Connect to → Show all (or: Control Panel → Networking)
- right-click any device and choose Properties
- click the Install… button
- choose category Service
- click Have Disk…
- select the path
C:\WINDOWS\inf
and click OK - choose the Wireless Zero Configuration and confirm all dialogs