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I have an ASUS-K55V. I had a dual boot with Windows 7 and Ubuntu 12.10.

Recently I upgraded my Ubuntu from 12.10 to 13.04 using the do-release-upgrade command. The update went fine, but after the update when i tried to boot into windows, it gave me an error, and restarted. Then i used a windows installation USB and used the repair commands 

bootrec /FixBoot  
bootrec /FixMbr

When my machine booted this time the grub menu didn't show up, so i used a live Ubuntu USB to recover my Ubuntu. I used the boot-repair tool suggested at Ubuntu Sharing.

Now I got my 13.04 back and i ran the update-grub2 command to recover my Windows, but it does not detect Windows 7 now. I tried using my Windows 7 Installation USB to use the Repair option, but even there it does not detect Windows 7.

Next I added the boot option myself by the procedure given at this Post, and this Post, yet there is no menu entry for windows in my grub.

Please help me to fix this issue.

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    Are you sure windows still exists? And please post the output paste that boot repair gave. It contains some useful info that we can use to help you.
    – daboross
    Jun 10, 2013 at 2:40

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My first thought is perhaps it's a UEFI motherboard (these are common within the last few years). Do you know how recent/which motherboard it is? If it is, a Windows 7 CD (perhaps borrow one if you don't have one) should autofix the boot record (it auto-detects on CD launch) and then you can use EasyBCD to add an Ubuntu boot record via their "Auto-detection" EFI loader.

If it's not UEFI, this answer may not help. The only other thought I had was use grub-mkconfig to make a new grub config file. Grub has a mode to auto-detect installed OS's. Best of luck

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