Reinstall Grub in target system

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http://unix.stackexchange.com – I'm trying to restore Grub to boot Linux Mint 13 and Windows 7. I just installed Windows 7, which rewrote the MBR, and then I was told I could simply boot Ubuntu live cd, install boot-repair, and reinstall grub over the MBR. I went through the installation, using the option to purge the old grub, but it failed, asking me to run some terminal commands to uninstall grub. After running those commands, I clicked the "Forward" button, but it said that grub was still installed. I eventually got grub installed on my MBR, and I can manually boot Windows using chainloader, but can't boot linux (it boo (HowTos)