I had a problem some ago after installing Ubuntu on a RAID array, my computer would not boot and displayed a Grub Error 17.
Here are some of the links that helped me to fix the problem:
http://ubuntuforums.org/showthread.php?t=1574765
https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows
http://ubuntuforums.org/showthread.php?t=1559762
had an error 17
had to rebuild the boot partition & then reinstalling grub2
http://grub.enbug.org/Grub2LiveCdInstallGuide
put in livecd 10.4
mnt drives with \dev\mapper\nvide3gegj0 <-- number at end chroot grub install pc might fail if so, then apt-get -update to update repository listings. then install dp installer