Hmmm. I did say that D/L was kinda flaky when it came to doing the Grub bit.
There's a number of ways to tackle this... try this one.
Boot from the Live CD again.
Start a terminal.
(substitute hda for sda, if needed)
chroot fdisk /dev/hda
press p to see the partition table
look reasonable - take a note of partition names /dev/hda1 etc., if you feel the need to.
press q to quit
Leaving the terminal session as it is for a while...
(Note: you may need to manually mount the partitions, if so just shout for help, if needs be)
Using the file manager see if /boot/grub/menu.lst exists on the root partition. View its contents; does it look half sensible?. There should be entries to boot D/L, with a recovery option and memory test, along with a Windows option.
If all looks reasonable...back at the terminal...
sudo chroot /dev/hda4 (the root partition)
sudo update-grub
sudo grub-install
Reboot and cross yer fingers. ;-)

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