If this is the fact and you haven't completely boned your system you should try this;
- Live CD Boot
- Install Kubuntu (NOT try)
- When you get to "Installation Type" screen;
- Choose Manual
- Select the root and do NOT format it
The install will warn you that software must be set up manually because your settings will be rewritten. None of your documents will get touched, but it would not hurt to make back up copies. This in essence paints over the grub and system only anything you have (games, apps, and docs) should remain intact. However once more, it would not kill you to download them or make back ups. To ensure and safeguard my system, I partitioned the HHD so the OS is on a 90GB chunk all by itself. Anything I add gets downloaded and installed to the other partition.
Otherwise it would be a heck of a lot simpler to make backups and do a fresh install.

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