Windows 7 ate my bootloader!

[slackjack]

I had windows vista and ubuntu as a dual boot system, then I upgraded to windows 7. This got my grub erased. Now I can only boot to Windows 7. How can I restore my grub so that it gives me the options to choose between ubuntu and windows (as it did before)?

Thank you.

[Arkitekt]

Has happened to me before, easiest way for me was to boot up into the Ubuntu Live CD and re-install grub from there

[slackjack]

Has happened to me before, easiest way for me was to boot up into the Ubuntu Live CD and re-install grub from there

Does this restore my grub to how it was before? My partitions have not changed. And how can I do this restore from the ubuntu live cd?