There is another way to do this Praseetha, Go to the Dell driver site, download there version of the driver. (step 1) extract the exe file but do not install it. (step 2) navigate to control panel and go to Device Manager. (step 3) you will notice it does
not show a video adapter of any sort, however down near the bottom you will notice it says unknown device,(step 4)click on it and go to update driver software.(step 5) click-->Let Me Pick From A List Of Drivers On My Computer
from there it will give you the option of have disk.(step 6) Click on Have Disk and then click
Browse. (step 7) Locate your Local Disk (C:)--> Open it, from there or somewhere in your Local disk you will see a folder that is labeled
Dell. (step 8) open folder name Dell next open folder name R153383 then open folder name
Drivers and then open the next folder labeled R153383then last but not least open folder name Packages. (step 9) click on the folder Labeled
Drivers go through that folder until you see a Text file labeled CL_45540 (step 10) click on that Text file and then find in the following list the name of your Video card and then click the next button. from there all that is left is to
wait and then restart your computer.
I will give the link to the file here in this Tutorial to the downloaded driver.
http://ftp.us.dell.com/video/R153383.exe
good luck and I hope this helps