How do I Format Windows VISTA?

I want to Install XP on my computer. At the moment i have Vista installed on my computer. THe problem is that i Cant find the 'Format option or button' When i go to the boot setup. I am totally stuck.Please Help me and try to explain it in simple details cuz i am a complete idiot in these kinda... show more I want to Install XP on my computer.

At the moment i have Vista installed on my computer.

THe problem is that i Cant find the 'Format option or button' When i go to the boot setup.

I am totally stuck.Please Help me and try to explain it in simple details cuz i am a complete idiot in these kinda things.

Another point to be noticed is that i dont have the Vista CD
but i.ve got the XP.

Your Help would be greatly appreciated!!!
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