Here is a situation I installed Ubuntu on a laptop using Wubi in Windows 7 drive.*The laptop is not mine.*I have installed and things worked by now perfectly without any problem.We are trying to set up a Xen (virtualization)environment in this laptop. After setting up every thing cleanly.When I needed to boot with following grub entries

menuentry "Xen Linux 2.6.32.27" {
      insmod ntfs
      set root='(hd0,2)'
      loopback loop0 /ubuntu/disks/root.disk
      set root=(loop0)
      multiboot /boot/xen.gz
      module    /boot/vmlinuz-2.6.32.27 dummy=dummy root=/dev/sda2
loop=/ubuntu/disks/root.disk ro console=tty0
      module    /boot/initrd.img-2.6.32.27
}

I got

error file not found
error unknown command 'multiboot'
error unknown command 'module'
error unknown command 'module'

Now to dig this issue further I reboot the machine and go to grub command prompt and manually pass on each of the above parameters which you see in the grub entry when I reached

grub> insmod multiboot

then I got following message on screen

error:file not found.

It looks like this wubi+ grub setup has just enough modules to use loopback file on ntfs, but the ACTUAL /boot directory is on the loopback NOT ntfs (hd0,2). Therefore any attempt to read any files from (hd0,2) simply wont work, cause there's no file there.I need to use insmod multiboot and command multiboot and module which are available in grub on a normal install without Wubi.But since the laptop is not mine so I am not allowed to partition it and have to make it work in this situation only.

While a normal Kernel is still booting? How can I get module multiboot in this Wubi based install.