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I have dual Ubuntu 12.04 and Windows 7 installed in my PC. I installed Ubuntu after Windows, and I have issues with GRUB. After installing Ubuntu, there was no boot loader in the start up, with an error message about missing OS. I tried boot repair, I can see the GRUB loader now and can access Ubuntu, uut I am not able to access Windows, even though I can see that in GRUB loader.

I tried to fix the Windows start up with my Windows Live CD, but that removed the GRUB.

What should I do in this case?

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Please run Boot-Repair's Recommended Repair, then indicate the URL that will appear. This will give us valuable information to help you. –  LovinBuntu Jul 29 '12 at 0:00

4 Answers 4

Try opening Ubuntu terminal and executing command

sudo update-grub

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I also got the problem like you and this is the way that I followed to fix it.

http://milindapro.blogspot.com/2012/01/revert-ubuntu-boot-loader-after.html

The simple answer is just re-install the grub loader. It will add all the operating systems on your system to boot menu.

Thanks

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It sounds like you accidentally removed your boot loader for windows. You need to get a windows repair disc and use it to restore your boot loader. It is fairly simple to do but you need the disc.

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1) You could add a boot entry for Ubuntu in Windows Boot Configaration Data (BCD) store using this guide and so create a dual-boot under control of Windows boot manager.

or

2) With Ubuntu Live CD reinstall GRUB2 using this guide so this would create a dual-boot under control of GRUB.

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He already reinstalled grub when he used boot-repair. –  Peachy Jul 28 '12 at 6:12
    
Yes, he reinstalled Grub but then he has used Windows CD to overwrite Grub again.... –  snayob Jul 28 '12 at 21:42

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