To fix a corrupted Windows 7 boot you simply boot with any Windows 7 boot disk, then select repair when given the choice. Windows will find the problem and fix the boot issue.
To fix a nonexistent grub boot menu you need to boot from an Ubuntu live CD and follow these instructions to reinstall the Grub menu:
It should look like this:
You need to boot your computer using Ubuntu Live CD or Live USB to repair the grub. Choose "Try Ubuntu."
Once you are finished booting open a terminal, then run the following commands one by one to install a program called "Boot Repair."
To add boot-repair to the repository, enter:
$ sudo add-apt-repository ppa:yannubuntu/boot-repair
To Update your repository, enter:
$ sudo apt-get update
To install boot-repair, enter:
$ sudo apt-get install -y boot-repair
When the installation is complete run "Boot Repair" on terminal by typing the following command:
$ boot-repair
NOTE: You don't have to update Boot Repair.
It will scan the System for few seconds and will show you the option "Recommended Repair" Click on "Recommended Repair" to start repairing the grub.
Once it's done you click on "OK" to restart you system and you should have a Grub as pictured above.
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