dual booting problem Win7, XP & Server 2003

hi, I have installled in my system windows xp in D drive, and server2003 in C drive, after that i have installed windows 7 in the place of server2003 by formating C drive, once i fineshed it up i am not getting dual boot menu, it directly booting to windows 7, i tried changwe active partition C drive to D drive, i will not abel to boot any 1 of os, i have tried editing boot.ini of windows7, but i am abel to edited, its not highleting, what is sollution for this dual boooting concern

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