My question was a bit wrong, I found that every operating system needs a boot loader, for Linux it's Grub or Lilo, for Windows it's NTLDR. You can not remove boot-loader of the operating system.
Solution was to configure Grub like so:
Code:
sudo gedit /boot/grub/menu.lst
Change line to so Grub have no time to ask.
And delete on the bottom of the file following lines:
Code:
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda4
title Windows Vista/Longhorn (loader)
root (hd0,3)
savedefault
makeactive
chainloader +1
Done!
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