No option to dual boot

basiclly when i open my computer it goese straight to windows 7/ windows xp (whichever is in the sata 0 slot at the time). my friend installed windows 7 and he got a option to pick from windows 7 or "earlier version of Windows" which is windows xp. any way i can do this so i dont have to keep switching my hard drives every time i want to change. thanks for the help anyone ^^

look for a program called EasyBCD.

vista boot pro

vistaboot pro is your will create a bootloader that gives you dual boot flawlessly for me.

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