Vista's BOOTMGR boot record can also load and boot BOOTMGR of Windows 7. Also Windows 7's BOOTMGR boot record can also load and boot Vista. Instead of bootsect.exe, you can also use BOOTICE to change your MBR or PBR. BOOTICE can be found here: http://www.boot-land.net/forums/index.php?showtopic=8986