Windows first
Then Linux, let grub it's job
If you installed Ultimate Edition 2.9 over your ubuntu 10.10 and it was a side by side.
The only chance you have is to use the windows disk and try to recover via repair option built into the windows disk.
If it was not side by side, each on there own partitions or drives.
A simple
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Sudo update-grub2
Should work to rebuilt grub and get your dual boot back in order.
Might even need to do both.
Not a fan of side by side for dual boot. Keep windows on it's own partitions or drives preferably. Makes it far easier to wipe and install newer versions of Linux.
Then grub will just auto detect your windows partition and configure during install of the new distro.