Akumtong Jamir,
Please continue with DELL-Chinmay S
When you installed the opertaing system, did you install the Dell System Software and the chipset drivers first? If not, the rest of the drivers will fail to install. How to Download and Install Drivers in the Correct Order
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Installing My Wi-Fi Technology Intel® My WiFi Technology is supported only on the Windows 7 operating system with driver versions 13.1.1 to Intel drivers 14.3
Download the drivers from Drivers & Downloads make sure the drivers are between versions 13.1.1 to 14.3 These drivers are the only drivers that support Intel® My WiFi Technology
If you cannot find the drivers from Drivers and Downloads, then try Intel's website and save them to your desktop
Make a system restore point.
Start, control panel, device manager, network adapters, right click on your adapter, left click uninstall. Tell it to remove the drivers and software.
Restart your computer.
When you log back in, the new hardware wizard will try to install the adapter but fail. Install the drivers you saved to your desktop
What happens?
Rick