Loading multiple copies of Windows XP on your computer will create a dual boot system -- two "computers" on a single physical machine, each with their own hard drive. Uninstalling one of your Windows XP copies is done by formatting the drive upon which it is stored, removing it from the system. This will also remove the rest of the information on the drive as well, so backup important files before beginning.
Restart your computer.
Highlight the copy of Windows XP that you are not uninstalling and press "Enter" from the onscreen boot menu.
Click "Start" and click "Explore."
Select "Computer" and right-click the drive containing the copy of Windows XP that you are uninstalling.
Select "Format," choose "NTFS" from the file system menu, and press "Enter" to remove the OS.
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