Help! I lost my Ubuntu!

[Cliffer Benny]

I reformatted my Windows HD and reinstalled Vista on it. My Ubuntu (10.10)
is on a separate drive (external USB 2.0).
Now when I start my computer, I can no longer choose which OS I want to use.
Neither the GRUB screen, nor the other Windows selection screen come up. It
just starts right into Winblows.
Is it possible to recover from this?
At the moment, I'm downloading the Wubi installer, hoping it will at least
let me access the Ubuntu drive.
Thanks

Ben
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