sistema operativo di default

[Massimo]

Ciao a tutti sono alle prime armi con linux e ubuntu vorrei capire come 
fare a far partire WXP all' avvio del pc ,  ho  provato a mettere ( 
default           6 )  da gedit ecc . e poi ho salvato ma niente non ho 
capito , aiutatemi !
grazie da massimo                                
 questo è quello che ho in  /boot/grub/nenu. lst :

## ## End Default Options ##

title        Ubuntu, kernel 2.6.10-5-amd64-generic Default
root        (hd1,1)
kernel        /boot/vmlinuz root=/dev/sdb2 ro vga=791 console=tty0 quiet 
splash
initrd        /boot/initrd.img
savedefault
boot

title        Ubuntu, kernel 2.6.10-5-amd64-generic Default (recovery mode)
root        (hd1,1)
kernel        /boot/vmlinuz root=/dev/sdb2 ro vga=791 console=tty0 single
initrd        /boot/initrd.img
savedefault
boot

title        Ubuntu, kernel 2.6.10-5-amd64-generic
root        (hd1,1)
kernel        /boot/vmlinuz-2.6.10-5-amd64-generic root=/dev/sdb2 ro 
vga=791 console=tty0 quiet splash
initrd        /boot/initrd.img-2.6.10-5-amd64-generic
savedefault
boot

title        Ubuntu, kernel 2.6.10-5-amd64-generic (recovery mode)
root        (hd1,1)
kernel        /boot/vmlinuz-2.6.10-5-amd64-generic root=/dev/sdb2 ro 
vga=791 console=tty0 single
initrd        /boot/initrd.img-2.6.10-5-amd64-generic
savedefault
boot

### END DEBIAN AUTOMAGIC KERNELS LIST

# 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/sda1
title        Microsoft Windows XP Home Edition
root        (hd0,0)
savedefault
makeactive
chainloader    +1