Martin Wittwer schrieb:
> Hello!
> 
> 1.) You should save your mbr with the dd command,
> because WindowsNT overwrite it during the installation.
> 
> dd if=/dev/wd0d of=/tmp/mbr.bin bs=512 count=1
> 
> This should save your mbr from wd0 to the file /tmp/mbr.bin
> 
> 2.) You should have a boot disk or cd to boot your NetBSD after the 
> WindowsNT installation.
> 
> You can now easy restore your old mbr and boot your NetBSD.
> Now you have to use a bootmanager for example the NetBSD internal or 
> other bootmanagers like grub.
> 
> Hope that helps - cheers,
> Martin Wittwer
> 
> ---
> 
Hello,

after a little search I found this.
Maybe it could help you:

http://www.netbsd.org/Ports/i386/faq.html#nt_boot