No such Partition - grub rescue

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http://askubuntu.com – I have a dual bootsytem on my laptop. Windows 7 and Ubuntu 12.04. While working in windows i deleted a small and (what i thought to be) a very non important partition of 100MB. Now when i restarted the laptop, it got stuck with the grub recue (no such partiiton) I know my data is still there of both my ubunutu and windows system. I have no other backup and i need to restore the boot again without removing any of the stored data. Please guide me how to restore my system without having to delete any data. Many thanks... (HowTos)