Comment 178 for bug 477169

For summarize: when do a kernel update wubi can't reads anymore boot files in virtual disk of the new kernel, so all /boot/ folder must be copied in other place in windows partition and modify grub to read to new location ( c:\boot\ in windows partition)
so new modify must be:

linux (hd0,2)/boot/vmlinuz-2.6.31-16-generic root=/dev/sda2 loop=/ubuntu/disks/root.disk ro quiet splash
initrd (hd0,2)/boot/initrd.img-2.6.31-16-generic

(i have windows partition on 0,2 / sda2 ) with the new (hd0,2) before /boot/

and from the grub type 'c' for console, then type
configfile (hd0,2)/boot/grub/grub.cfg

with american layout keyboard.......