Hey Saayacoolu,
did u tried the six avaiable drivers in -> HDMU Center -> System Control -> Wlan driver*: <-
If one of those driver will work, you'll be able to setup your WIFI settings - WIFI configuration will be visible in Network Configuration. (Menu->Settings->System->Network)
Your DWL-G132 has an Atheros AR5523 chipset - don't know if it works.
To make sure:
after applying a driver you have to restart ur Topfield.