A first step in the transition from Windows to Ubuntu is often the installation of a dual boot system, having booth Windows and Ubuntu on the same computer. This gives you the opportunity to slowly move to Ubuntu, while still having Windows as a backup. After you get used to Ubuntu and you can perform all the required tasks therein, you might want to get rid of Windows. This short tutorial shows you, how you can easily remove Windows 7, 8, XP or any other Windows release from a dual boot PC with Ubuntu.
You can burn the Gparted tool to a CD using the Brasero Disc Burner or write it to a USB stick with UNetbootin (both of the tools can be found in the Ubuntu Software Center):
Important boot loader commands:
sudo sed -i 's/GRUB_TIMEOUT=10/GRUB_TIMEOUT=0/' /etc/default/grub