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I had got 2 partitions on my harddrive:
1. win7;
2. Ubuntu 11.10;
As it can be predicted the GRUB loader was in the second partition and this partition was formated from ext4 to ntfs.
Now I get this message on load:
error: no such partition
grub rescue>
grub rescue> ls
(hd0) (hd0,msdod5) (hd0,msdos4) (hd0,msdos2) (hd0,msdos1)

Can i boot from GRUB's rescue to win7 without reinstalling Ubuntu to get GRUB?
I've tried:

grub> rootnoverify (hd0,0)
grub> makeactive
grub> chainloader +1
grub> boot

that i've read from Ubuntu's forum, but GRUB rescue returns:
Unknown comman 'rootnoverify' and so on for every command.

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