linux - How to add a Windows 7 to grub2

I installed Ubuntu and Windows 7(windows first). After that I can't boot into Windows.

sudo update-grub2 Not see Windows.(but file explorer see this partition).

I add to /etc/grub.d/40_custom

menuentry ‘Windows 7′ {
set root=’(hd0,4)’
chainloader +1
}

And after that update-grub2, but when I restart my computer grub isn't starting(starts ubuntu).

fdisk -l
Urządzenie Rozruch   Początek      Koniec   Bloków   ID  System
/dev/sda1   *           1       11077    88969217    5  Rozszerzona
/dev/sda4           11077       19457    67317760    7  HPFS/NTFS
/dev/sda5               1       11077    88969216   83  Linux

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