We are experiencing some slight technical difficulties…
Lesson of the day:
Remember where your boot loader is to your main OS, otherwise, you might just delete the partition that it is on and destroy your partition table while trying to fix it.
(Yes, I deleted the Vista partition which had the XP boot loader on it – oops!)
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Booting off the Vista DVD and selecting to repair (or booting up into WinRE - Windows Recovery Environment) should automagically repair this