Boot manager not installing in mbr

[Karl Friedrich Gauss]

I'm trying to install freebsd 4.10 on second hard-drive. On the first hard 
drive is winXP. When I run sysinstall from a cd-rom, it seems to be unable 
to modify the mdr of my first hard drive. I tried to go into fdisk, the just 
quit and install boot manager on first hard disk. It doesn't work.

When I reboot, I still enter in windows. What can I do?

Jeremie

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