Hi Jai Singh Rawat,
Please ensure that the Bluetooth is enabled and powered on. You may press Fn+F2 key on keyboard to toggle Bluetooth. You may also press Windows + X to bring the Windows Mobility Center and check if the Bluetooth is on or off. Also, you might need to make laptop discoverable under Bluetooth settings, so that other devices may find the laptop. You may refer to the link : http://bit.ly/12LOdt8
If the issue persists, please reply with the operating system installed on your computer and a screenshot of device manager.
Hope this helps. Please reply with the findings.