How to Repair Grub

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http://askubuntu.com – Yesterday I installed ubuntu 12.04.1. Note : its a dual boot system along windows 7 At first grub was appearing and i was able to start ubuntu but then i had to switch to windows but windows was not booting when i select windows 7 it jumps back to grub window. So i fix the Windows Boot Loader using repair from windows media and wolla windows started to boot but Ubuntu Grub gone. Now how to enable Grub when I cant even access the Ubuntu. Unfortunately i added the Bootloader of Ubuntu on same Harddrive as of Windows. In previous installation i put the Grub on second HDD but this time i forgo (HowTos)