Dual Boot. Broken Windows 7 MBR and Grub

Question

At the beginning I have been Windows 7 on /dev/sda1. After that I have installed Ubuntu in /dev/sda7 and set Grub partition to /dev/sda1. Which broked down Windows 7 boot. Ubuntu have booted normally from Grub Menu, but when I choosed Windows 7, grub disappared and after 1 second appeared, and doesn't load. After that I have searched for some fixes for Windows 7 boot, and I do some "fixings". The result - Grub doesn't load.

At this moment I have broken Windows 7 loader and broken Grub. And sitting with Ubuntu Live CD. How can I fix this with Ubuntu live CD? If possible please give step by step explanation, because I newbie in Ubuntu and Linux.

EDIT: Grub loader fixed. But anyway... Windows 7 doesn't load from Grub. I'm using Grub2.

EDIT2 As I understand I need to run bootrec.exe /fixboot to fix Windows 7 bootloader. But I don't have Win7 DVD at this moment. Any way to do same from Ubuntu?

EDIT3 Boot Info Script RESULTS.txt is here: http://pastebin.com/Z70fKQHJ

Solution 1

There is no way to fix the windows 7 bootstrap from Ubuntu, you will need to do so with the windows 7 DVD but, which size is sda1, if it is +/- 100Mb, you should not have much troubles fixing it but, will need to reinstall grub to another partition. If it is way bigger than 100Mb, this mean it was not the system reserved space and that you have installed Grub over your windows 7 thus, deleting windows 7 completly....

Solution 2

I had same issue. After trying other solutions on the internet, I ran from Ubuntu terminal:

> sudo update-grub

It located the Windows and Ubuntu installations automatically fixing the boot issues.

Hope this helps someone.

Solution 3

• Here is a link for a recovery ISO,download and burn it into a cd.
• Boot with your Windows 7 recovery disk.
• Hit Enter at the language selection prompt and then hit R for Repair to get to the Repair section.

• Select the command prompt and type in the following command

  bootrec.exe /fixmbr

Comments

[karthick87]

Post the results of bootinfoscript.sourceforge.net so that we can help you.

[Toktik]

results.txt is here: pastebin.com/Z70fKQHJ

[karthick87]

I dont think you can repair it from ubuntu.You need windows 7 disk.

[Toktik]

I have changed grub partition to /dev/sda. So at this point, I need to only do bootrec.exe /fixboot?

[Mobidoy]

yes, unless you had put Grub over Win7. Once your win7 boot is restored, you may need to log again with the ubuntu live disk, go in a terminal and type "sudo grub-update" so it points the items (ubuntu and win7) to the proper partition

[Takkat]

Toktik most likely did overwrite the Windows partition boot record on /sda1 when he installed Grub2 there.

[snayob]

The proposed solution links to a PAID download. There are links on the internet to download full Windows 7 installation images (containing recovery) from DigitalRiver without paying a cent !

[Darryl Williams]

First do this and after fix grub

[udog]

This worked for me today. Fixed grub using the amazing Rescatux (supergrubdisk.org/rescatux), then ran update-grub and all is well in my dual-boot world.