BOOTMGR image is corrupt fault while dual booting Ubuntu and Windows7

Question

I have Ubuntu Precise beta 2 and Windows7 set up to dual boot.

The set up had been perfect, until today, with a black screen presented when trying to boot Windows with a BOOTMGR image is corrupt, cannot boot fault.

Is there any way to fix this from Ubuntu, or is a reinstall my only option?

Answer 1

You can always rescue a broken Ubuntu boot by going back to your installation media. (Either a LiveCD or a LiveUSB). Booting up to that will place you in a working Ubuntu environment where you can attempt to fix whatever is preventing the system from booting.

There is a utility called Boot Info Script that will gather all the relevant info and save it to a text file. There is a walk through here. You can then copy this to pastebin or otherwise so we can tell you what you need to do to fix your boot.

Answer 2

I would also suggest booting into live media, be it in the form of USB or CD/DVD to enter a working desktop environment, although I have not had any experience with Boot Info Script and would suggest that, if you have problems with it, you should give "Boot repair" a go. Once in a working desktop environment and connected to the internet, run these commands to install "Boot Reapir":

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

And then this one:

sudo apt-get install -y boot-repair && boot-repair

Once this has completed, if you feel confident, have a go with the software and see if it can fix your issue.

For more information and guidance visit the link below.

EDIT: After re-reading your question it seems that your issue is with the Windows side of things. I have had the same issue before and found a solution online somewhere, although I cannot remember it, I do remember that you can access a cmd using the Windows 7 installation disc and visiting the repair option. A google search might come up with a solution using the command prompt.

Boot Repair