نمیدونم چرا اینطوری می فرمایید ولی تا حالا که برای من و دوستانی که 7 رو نصب کردند اینطوری نبوده، یعنی ندیدم با نصب 7 روی XP منوی Boot Loader ظاهر نشه، اینها (1 و 2 و 3) رو ببینید که تقریباً مواردی هست که devil00x مطرح کردند ...
If you try to modify the boot options the oldfashioned with boot.ini file, you get the following warnings:
;Warning: Boot.ini is used on Windows XP and earlier operating systems.
;Warning: Use BCDEDIT.exe to modify Windows Vista boot options.
If you examine, Windows 7 doesn't have NTFS write permissions on XP system partition, even though it creates a "boot sector" inside it, cause it is the first one in line on the system disk, which is shared half on half by both systems.