Tata Photon Whiz Olive CM200 not installing on windows 7(Drivers not installing)

I have just purchased a post paid Tata Photon whiz Olive CM 200 usb modem for wireless use for my laptop.My laptop runs on Windows 7
When i plugged the usb device on my laptop , a message comes "drivers not installed " and goes away. I tried troubleshooting it , but with no luck.
Pls suggest where i can download the drivers of the device that are compatable on windows 7.

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