Hi pratiknk,
I would like to know if operating system was reinstalled in the computer.
If the operating system was reinstalled in the computer, drivers should be installed in correct order. Please use this link which shows the right order: http://tinyurl.com/8xvx6xy
If you have the resource disk, install the drivers in the correct order or use this link to install the drivers for the computer: http://tinyurl.com/cgcakw3
Click the link above, enter the service tag and select the operating system from the dropdown and follow the order in installing the drivers.
Check and reply for further help.
