[ubuntu-in] how to restore grub for ubuntu 12.04

[Sriranga(78yrsold)]

Experts,

I had installed 12.04 within winXP using wubi.exe -  Due to some problem -
I had re-installed WinxP by using  fixmbr and fixboot.
now grub for ubuntu 12.04 has gone.

Without re-installing ubuntu 12.04, is it possible to restore grub ? If so
kindly guide me step by step procedure
to be followed. I have CD for 12.10 and not  for 12.04 - since it was
installed thro'wubi.exe -

With Best Wishes,
-sriranga(79yrs)
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