Hi balkrishna,

Install the notebook and chipset drivers first then try to install the rest of the drivers on the computer. Download and install the drivers on the computer in a specific order, here is a link for your reference: http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&docid=268873&doclang=en&l=en&s=gen&cs=

Also providing the links for all the drivers which are applicable for your computer:

Notebook: http://dell.to/RbBje3

There are 3 Chipset drivers: http://dell.to/QHpdvi

http://dell.to/UgSlgP

http://dell.to/WoeF5m

USB 3.0 port drivers: http://dell.to/WoeGWO

Ethernet drivers: http://dell.to/VyYKlj

For the network driver, I request you to private message the system service tag number. To private message, accept my friend request; click on my user name and click start conversation