TO GET RID OF THE WINDOWS VISTA BOOT LOADER AFTER FORMAT:
1) Boot up XP and put your Windows Vista install dvd into your dvd-rom drive.
2) Start > Run > cmd.exe
3) In the command prompt enter this magical line
Drive:\Boot\Bootsect.exe -NT52 All
(Replace Drive with your dvd-rom location ie F:\Boot\Bootsect.exe - NT52 All)
4) This switches your boot loader back to the XP boot loader which can be modified in the boot.ini
5) Next time you start up your PC the boot loader will be gone.
donc boot sur xp, monter l'image de vista ou mettre le dvd dans le lecteur, démarrer, éxécuter, cmd
puis lettre du lecteur (exemple D

D:\Boot\Bootsect.exe -NT52 All