restoring XP,s bootmanager

hi guys.. i had xp installed on my c: and vista on d:
the boot manager was vistas ... last night i formatted my d: drive.. that is vista,s drive.. but the boot manager is still showing vista.. now i want to restore Xp,s boot manager.. that is i want no boot manager at all cos i dont have two operating system,s nymore. ny idea on how can i delete that vista,s boot manager and restore it to xp,s boot manager..
btw im still able to boot in xp with ease selecting xp from vista,s bootmgr.