Check this script, I am getting the values. May be check whether the proxy is blocking any request. In some companies they will block, you check in machine which has full internet access without any blocking.
[result/geometry/location/lat] as [location/lat],
[result/geometry/location/lng] as [location/lng],
%Key_GeocodeResponse_62C7A0A69859D655 // Key for this table: GeocodeResponse
FROM [http://maps.googleapis.com/maps/api/geocode/xml?address=Delhi&sensor=false] (XmlSimple, Table is [GeocodeResponse]);