How to fix Vista/Ubuntu MBR?

I played around with the EasyBCD program in vista to try and make vista's bootloader the default (instead of Grub), but I've messed things up.

I used a LiveDVD to at least reinstall Grub and now I can boot into the Ubuntu partition. But, when I select Vista from the grub menu, I get the "NTLDR is missing" message. How can I repair the MBR so that grub will boot vista properly? Thanks
also, my laptop did not come with a Vista install DVD and there is no other recovery disks available - I have to do everything from Ubuntu it seems

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