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How to Repair Grub while dual booting ( win7 / ubuntu 11.10)

I had installed Lubuntu on a PC with Windows XP and used dual boot for some time with no problems.

Since I had almost abandoned Windows (kept it for printing...) I decided to resize its ntfs partition and add the free space to my Ubuntu space.

Tried that with a gparted stick and a live cd but would not work due to an issue related to the ntfs partition: gparted signaled with a red exclamation point that there was a problem with that partition. I read that a checkdisk might solve it but in the end used EaseUS in Windows to shrink (resize) the ntfs partition and create a new one (ext3) from the space left.

All seemed ok with that procedure: but resizing the partition and moving the data might have affected the grub file: or whatever the following message means, which I get when trying to start my pc:

error: file not found
grub rescue>

Booting from a live cd I see, beside the shrinked windows partition and my old linux one, the newly created partition, containing a directory called lost+found that I cannot open.

Can I fix the grub file and recover both my XP and Lubuntu installations?