Remove XP/Vista from an XP/Vista dual boot

How to  remove the old XP from your system form a dual boot?

• Simply load into Vista and format the partition XP is currently installed on. Since the Vista bootloader has control of the boot, there is no need to modify the boot.ini of XP.
• Restart your computer with either Vista CD 1 or your Vista DVD in the drive, if you don't you will be prompted to pick an operating system.
• Once into setup, choose repair console from the first screen (not install).
• Now the last option is for a DOS prompt, pick that.A DOS prompt appears, and type the following:
  bootrec.exe /fixmbr (This will essentially remove XP from the Vista bootloader)
  bootrec.exe /fixboot (This will  check that XP is no longer present in Vista's boot.ini)
• Restart and  there will be no more XP.

How to remove Vista and its new boot loader from your system?

• Load into XP and format the partition Vista is currently installed on. Since the Vista bootloader has control of the boot, there is no need to modify the boot.ini of XP.
• Restart your computer with the XP cd in the drive, if you don't you will be prompted to pick an operating system.
• Once into setup, choose repair console.A DOS prompt appears, and type the following:
  fixmbr (This will essentially separate XP and Vista )
  fixboot (Tthis will check that Vista is no longer present and put the XP boot.ini loader back in place.)
• Restart and  there will be no more Vista.