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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