Comment 141 for bug 477169

If all kernels become unbootable and you don't have a initrd for your system, then you are in a deep sh... that is why I advise to copy it to c:\. But you can use Live CD to access your files in the root.disk.This is how:

Boot from the Live CD and at a terminal prompt, enter:
(1) sudo mkdir /win
(2) sudo mount /dev/sda1 /win (in your case should be sda2)
(3) sudo mkdir /vdisk
(4) sudo mount -o loop /win/ubuntu/disks/root.disk /vdisk

E Voilá! You have the root.disk in /vdisk and the windows disk in /win. Now you can copy your precious files to windows, and reinstall Wubi!