dual boot

[Ultimate]

i have on my hard disk two OS. freebsd and win2k
i reinstalled the win2k and upon booting i made the 
partition with the freebsd active.
but now i can only have access to freebsd.
my win2k which i know is still there doesn't
get to load since freebsd boot0 doesn't register it.
i have tried to ways of getting it up

1. boot0cfg -m 0x3 ad0
error msg:-  boot0cf: /dev/ad0: unknown or
incompatible boot code

2. fdisk -B -b /boot/boot0 ad0
error msg:- fdisk: can't write fdisk partition table:
Operation not permitted


Obviously, I am a newbi ... so further illustration
with the solution would be appreciated

Thankz

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