Grub2 Won't boot Windows 7

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http://askubuntu.com – I was using Windows 7, my computer hibernated after the battery died, I can no longer boot into Windows from grub, the menu entry is there but selecting it simply shows the grub2 menu again (no restart or anything, just flashes the screen). I have tried sudo update-grub and it told me it found the Windows 7 Install etc, but it did not change anything. I can mount the windows partition in nautilus so the install is still there. How can I fix, or at least set on the path of fixing this issue? (HowTos)