Changer la priotité du boot

Bonjour,

La question a surement déjà été posé mais je n'ai pas trouver le topic sur le forum donc dsl si la réponse a déjà été donné.

Alors voila mon problème j'ai installer windows7 puis ubuntu avec grub qui me permet de choisir entre quel OS donc tout sa est correct mais je voudrais que mon ordi se boot directement sur Windows 7.

Voici le fichier grub.cfg qu'il faut modifier mais je sais pas ce qu'il faut modifier ^^

# 
# DO NOT EDIT THIS FILE 
# 
# It is automatically generated by /usr/sbin/grub-mkconfig using templates 
# from /etc/grub.d and settings from /etc/default/grub 
# 

### BEGIN /etc/grub.d/00_header ### 
if [ -s /boot/grub/grubenv ]; then 
  have_grubenv=true 
  load_env 
fi 
set default="0" 
if [ ${prev_saved_entry} ]; then 
  saved_entry=${prev_saved_entry} 
  save_env saved_entry 
  prev_saved_entry= 
  save_env prev_saved_entry 
fi 
insmod ext2 
set root=(hd0,6) 
search --no-floppy --fs-uuid --set 8d9b630a-5c40-4736-909b-6a51266de486 
if loadfont /usr/share/grub/unicode.pf2 ; then 
  set gfxmode=640x480 
  insmod gfxterm 
  insmod vbe 
  if terminal_output gfxterm ; then true ; else 
    # For backward compatibility with versions of terminal.mod that don't 
    # understand terminal_output 
    terminal gfxterm 
  fi 
fi 
if [ ${recordfail} = 1 ]; then 
  set timeout=-1 
else 
  set timeout=10 
fi 
### END /etc/grub.d/00_header ### 

### BEGIN /etc/grub.d/05_debian_theme ### 
set menu_color_normal=white/black 
set menu_color_highlight=black/white 
### END /etc/grub.d/05_debian_theme ### 

### BEGIN /etc/grub.d/10_linux ### 
menuentry "Ubuntu, Linux 2.6.31-20-generic-pae" { 
        recordfail=1 
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi 
 set quiet=1 
 insmod ext2 
 set root=(hd0,6) 
 search --no-floppy --fs-uuid --set 8d9b630a-5c40-4736-909b-6a51266de486 
 linux /boot/vmlinuz-2.6.31-20-generic-pae root=UUID=8d9b630a-5c40-4736-909b-6a51266de486 ro   quiet splash 
 initrd /boot/initrd.img-2.6.31-20-generic-pae 
} 
menuentry "Ubuntu, Linux 2.6.31-20-generic-pae (recovery mode)" { 
        recordfail=1 
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi 
 insmod ext2 
 set root=(hd0,6) 
 search --no-floppy --fs-uuid --set 8d9b630a-5c40-4736-909b-6a51266de486 
 linux /boot/vmlinuz-2.6.31-20-generic-pae root=UUID=8d9b630a-5c40-4736-909b-6a51266de486 ro single  
 initrd /boot/initrd.img-2.6.31-20-generic-pae 
} 
### END /etc/grub.d/10_linux ### 

### BEGIN /etc/grub.d/20_memtest86+ ### 
menuentry "Memory test (memtest86+)" { 
 linux16 /boot/memtest86+.bin 
} 
menuentry "Memory test (memtest86+, serial console 115200)" { 
 linux16 /boot/memtest86+.bin console=ttyS0,115200n8 
} 
### END /etc/grub.d/20_memtest86+ ### 

### BEGIN /etc/grub.d/30_os-prober ### 
menuentry "Windows 7 (loader) (on /dev/sda1)" { 
 insmod ntfs 
 set root=(hd0,1) 
 search --no-floppy --fs-uuid --set 2a688eed688eb6db 
 chainloader +1 
} 
### END /etc/grub.d/30_os-prober ### 

### BEGIN /etc/grub.d/40_custom ### 
# This file provides an easy way to add custom menu entries.  Simply type the 
# menu entries you want to add after this comment.  Be careful not to change 
# the 'exec tail' line above. 
### END /etc/grub.d/40_custom ###

Merci