That is an easy one. Try to locate in the net gparted. Gparted allows you to do whatever you want on an hd. The main thing that you have to dowload the iso file. The burn the iso, it creates a boot cd. Now boot with this cd (I asume that you know how to configure your pc´s bios to boot from a cd) and voila¡¡¡ Gparted uses a graphic interface to make any operation.