Yes, I mean installing FreeBSD 8.0 with sysinstall, and choose "Leave the Master Boot Record untouched" in boot manager selection step.
I have previously installed Microsoft Windows MBR program in the master boot record, and would like to use NTLDR to load FreeBSD boot1 which finally boot FreeBSD. But after install FreeBSD, it writes a standard "mbr" program to the master boot record rudely, overwriting existing MBR program even I choose "Leave the Master Boot Record untouched". The result is: I can only boot FreeBSD, and has to edit "mbr" using boot0cfg, to restore Windows bootstrap.