So, what is the status now? Can boot, but not access your files, or cannot boot at all? Use the following procedure to try different boot configurations:
Originally Posted by chris189
Boot from your live CD. Choose "Try Ubuntu". You will get to a desktop. Open a terminal and type:
where <root partition> is your "/" filesystem (i.e. /dev/sda7)
sudo mount <root partition> /mnt
sudo mount /boot /mnt/boot (only if boot loader is in a separate partition)
sudo mount --bind -t proc /proc /mnt/proc
sudo mount --bind /dev /mnt/dev
sudo mount --bind /sys /mnt/sys
grub-install will overwrite mbr and should remove any windows leftovers.
Check the terminal output for any windows partitions. Clean them up and reboot.
grub-mkconfig -o /boot/grub/grub.cfg (or wherever is your grub.cfg)