Repairing Ubuntu without loosing data or breaking Windows

[Enrique Becerra]

Hi people
Is there any guide I can follow to repair my Ubuntu installation
without loosing important Ubuntu data or breaking Windows XP
installation?

My PC has a dual boot (Ubuntu 10.10 / Windows XP) but Ubuntu is not
working because it freezes when gdm shows and can't run in safemode
from any grub entry. I have my CD ready to begin, but I get "scared"
when I reach the point where it asks me partition stuff... will it
format everything again, right?

Hope someone can help me
Greets,
_____________________________
Enrique Becerra
twitter: @kabeza
http://www.beza.com.ar