If you are replacing the primary boot disk (and the OS with it) this may be very easy.Windows 2000/ME/XP/Vista: Once the new hard disk is installed, simply boot from the windows CD. The installation...
Yes. However, formatting the drive is not a guaranteed way of erasing it. In most versions of Windows, you can right-click on the drive letter in Windows Explorer and select "Format".
Boot from something else (CD, floppy...) then rather than let it go into installation mode, just format. Not all bootable CD's and floppies will have format on them, so you'll need the right disk....