Transferring Windows to a new hard drive.

I want to transfer my “Windows Installation” from one hard drive to another. I searched on the internet a found a method describing that I have to only copy and paste files. It tells me to Install the Windows system files to the new drive, you may go to the MS-DOS prompt and type SYS D: at the C> prompt."
I have currently installed Windows on drive C. And I want to transfer it on drive G. I try to do as mentioned above But I did not see any installation on drive G. Kindly inform me how to perform this task.
