How To Completely Erase Sorority Account On Facebook How Do I Erase My Hard Disk Completely So I Can Re Start All Over?

How do i erase my hard disk completely so i can re start all over? - how to completely erase sorority account on facebook

Currently I have Microsoft Office XP on my computer, but now I want to connect to Microsoft Windows 7 to upgrade, and I want to completely erase your computer hard drive for more space for the software is possible, but you do not know how: (.
Help please
Thank you:)