PC doesn't recognize ESP8266 ESP-12E WiFi Shield

Hello,

A few weeks ago I bought this ESP8266 Shield: http://www.ebay.de/itm/ESP8266-Shield-ESP-12E-UART-WIFI-Wireless-Shield-for-Arduino-UNO-R3-MEGA-ESP8266-/172125596867?hash=item28137c2cc3:g:-Q8AAOSwLnBX7c4x
When I add the WiFi Shield to my Arduino Uno the onboard LED of the WiFi Shield works but my PC doesn't display the Shield in the Device section. There's only the Arduino UNO
BTW: I'm totally new to Arduino.