Installation of Arduino Wifi shield

Sir,
I am using Arduino Uno R3 (Barcode - 7//640152//110092//>) using Arduino sketch IDE version of 1.6.1 and an Arduino Wifi Shield R3 (Barcode - 8//058333//491158//>) with (MAC address 90-A2-DA-OF-DO-6C).
The wifi shield is not getting initialized when I m mounting it on the Arduino Uno board. Even on uploading the examples of Wifi module (ScanNetworks) … the output on the serial monitor is displayed as “” Wifi Shield Not present".

Please help me out with this problem …
1>What should be done at present ???
2>Should I upgrade the firmware of the Shield??? or any other suggestion is welcome…

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