Hi hemantag108,
Try updating the system BIOS. The link is http://dell.to/1310AlK.
Note: Before updating BIOS please ensure that:
*Battery is 10%> or >10% charged
*Battery charger should be connected
*No external devices (flash drives, printers, external hard drives) should be connected.
*All other programs should be closed and documents saved
Also share the screenshot of Device Manager with Network adapters expanded.
- Press ‘Windows’ key + R on ‘Desktop’ screen
- Type ‘devmgmt.msc’ in run box and press ‘Enter’
- Click > sign next to ‘Network adapters’
Keep me posted with the results. I will be glad to assist you further.