1.How do i get the driver and pliz give me the procedure for
installing the driver.
Open terminal and type the following:
sudo apt-get install nvidia-current
Restart your system.
Open terminal again and type the following:
sudo nvidia-xconfig
Log out and log back in. You'll find nVidia settings at System > Administration > nVidia XServer Settings
Let me know if it worked.
2.I also want to know the procedure for removing Linux from the
system.
I wish you don't do that. It's a hassle to get some drivers on linux systems but you'll get used to it eventually and might even enjoy the process. :)
However if you are really inclined to the decision of getting rid of ubuntu, just format the partition in which you installed it. If you used a wubi, you'll find the option of uinstalling it at the "Add or Remove programs" in control panel of Win7. Or if you are trying it on VMWare or something like that, just delete the virtual drive. Ubuntu will be gone.