How to Downgrade from Windows 7 to Windows XP

This How-To Guide will walk you through the downgrade process from Windows 7 to Windows XP. Note that all files and programs on the computer will be lost.
Place the Windows XP disc in the optical drive.
Turn off the computer.
Wait 10 seconds after computer is off then turn the computer on.
When you see the prompt below press the spacebar on the keyboard:



After pressing the spacebar