I'm quite rusty at dealing with boot issues but Boot Repair may help:
https://help.ubuntu.com/community/Boot-Repair
The specific issue you're describing is explained here:
http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:Boot_Sector
Lance
________________________________
From: Hadi <hadirez...@gmx.com>
To: Ubuntu-GNOME@lists.ubuntu.com
Sent: Wednesday, February 19, 2014 4:20 PM
Subject: installed Ubuntu gnome - think messed up the boot loader
Hello!
I've installed Ubuntu gnome alongside of windows 7, though since i had two
partitions, i went through the manual installation.
before mentioning my problem, I'll say what i have done.
I had three partitions:
/dev/sda1: 100mb
/dev/sda2: 160gb (my windows partition)
/dev/sda3:330gb (for my ubuntu gnome)
I have selected /dev/sda3 for Linux installation and set the formatting
options.
Then, i accidentally chose the /dev/sda1 for putting the grub booter, do to the
orca (the screen reader) being buggy in the partitioning screen, it kept
forcing me to fumble around with the keyboard.
What is happening now is that i can't load windows. I can't see the grub menu
do to my visual impairment, but i suppose that the last item is always windows
7. i hold down the down arrow key for 5 seconds then press enter, and nothing
happens.
I believe i have messed up something by installing grub in /dev/sda1 which was
100mb?
Thank you
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