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I'm not sure how it happened, but I lost the "windows 7" entry from my Grub2 screen after updating ubuntu.

How can I add it ? I knew how to do it in grub legacy, not in grub 2

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up vote 2 down vote accepted

You could try installing grub-pc tools to automatically detect all available operating systems

sudo aptitude install grub-pc

and then update grub2 for your next restart

sudo update-grub2

if Windows is correctly installed it should now be added to grub.cfg

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Doesn't seem to find windows ... arg maybe my partition is corrupted in some way :'( – Manu Jan 20 '11 at 13:26
In that case I'd backup everything from the Windows partition as soon as possible and reinstall. Can you browse the windows partition when logged in Ubuntu? – bruno077 Jan 20 '11 at 15:21
yes, I can see all my files ... my windows partition commited suicide, there's no other explanation. – Manu Jan 20 '11 at 17:54

This article seems to answer the question :

How to add Vista/Windows 7 partition to Grub 2 (Ubuntu 9.10, Karmic Koala)

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