multiboot missing boot ini

Hello.
I installed Windows Vista successfully (on E:\Windows) and the multiboot works well but when I choose to boot Windows XP (on C:), I get a message (during one second) that tells me "missing boot.ini, booting on C:\Windows by default" The booting of XP works well despite this message but I would like to know how to avoid this message (because I know that boot.ini isn't use anymore by Vista Multiboot)
Thanks for your answers.
Patrick Schevenels