ubuntu10.04和win7旗舰版32位优先启动设置

ubuntu10.04和win7旗舰版32位优先启动设置
grub.cfg全部内容如下
#
# Sample GRUB configuration file
#

# Boot automatically after 30 secs.
set timeout=30

# By default, boot the first entry.
set default=0

# Fallback to the second entry.
set fallback=1

# For booting GNU/Hurd
menuentry "GNU (aka GNU/Hurd)" {
    set root=(hd0,1)
    multiboot /boot/gnumach.gz root=device:hd0s1
    module /hurd/ext2fs.static ext2fs --readonly \
            --multiboot-command-line='${kernel-command-line}' \
            --host-priv-port='${host-port}' \
            --device-master-port='${device-port}' \
            --exec-server-task='${exec-task}' -T typed '${root}' \
            '$(task-create)' '$(task-resume)'
    module /lib/ld.so.1 exec /hurd/exec '$(exec-task=task-create)'
}

# For booting GNU/Linux
menuentry "GNU/Linux" {
    set root=(hd0,1)
    linux /vmlinuz root=/dev/sda1
    initrd /initrd.img
}

# For booting FreeBSD
menuentry "FreeBSD (or GNU/kFreeBSD), direct boot" {
    set root=(hd0,1,a)
    kfreebsd /boot/kernel/kernel
    kfreebsd_loadenv /boot/device.hints
    kfreebsd_module /boot/splash.bmp type=splash_image_data
    set kFreeBSD.vfs.root.mountfrom=ufs:ad0s1a
}
menuentry "FreeBSD (or GNU/kFreeBSD), via /boot/loader" {
    set root=(hd0,1,a)
    kfreebsd /boot/loader
}

# For booting NetBSD
menuentry "NetBSD" {
    set root=(hd0,1,a)
    knetbsd /netbsd
}

# For booting OpenBSD
menuentry "OpenBSD" {
    set root=(hd0,1,a)
    kopenbsd /bsd
}

# For booting Microsoft Windows
menuentry "Microsoft Windows" {
    set root=(hd0,1)
    chainloader +1
}

# For booting Memtest86+
menuentry "Memtest86+" {
    set root=(hd0,1)
    linux16 /memtest86+.bin
}

# Change the colors.
menuentry "Change the colors" {
    set menu_color_normal=light-green/brown
    set menu_color_highlight=red/blue
}
以上就是全部内容   请高手赐教           谢谢

set default=0 这里改一下，不过，貌似grub启动的时候有好几项的，所以，0应该改成3。。不行的话从1开始一个一个的试，反正我的双系统设置的是3

请问你是用哪个系统作为引导器？如果这个搞清楚，我就可以帮你…