How to reinstall xp over vista

here's the deal,my sister gave me a computer that was completely virues to hell-it had xp home editiion on it.i used my vista disk to wipe it but i cant use it because i used all my activation i burned a xp disk figuring i could use the key that came with the computer that was given to me.but when i put the xp set up disk into the CD and boot from the CD it wont work because vista overrides xp and it wont wipe clean for a new wondering if there is a way to remove vista so i can have a clean harddrive to install the xp back into it?..if i put the vista cd back in will i be able to wipe the HD without installing vista again?
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  1. Best answer
    An XP boot disk will wipe out anything on the drive. Just tell it to format and create a new partition. Vista is not even running when you boot off a CD, so it has no say in "overriding" anything. Just make sure that the XP key you have matches the XP version you are using or the key probably won't work.
  2. Best answer selected by nitrotoad.
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