please help, destroyed ext3 root partition

[orange <orange47@gmail.com>]

can someone please help me recover Debian ext3 partiton (/)
I tried booting windowsxp by typing some commands at boot prompt and
it seems to have trashed (MBR?) linux partition.
the other Linux partitions are fine (home).

is there a tool that can help me recover /

I think I tried this:
map (hd0) (hd1)
map (hd1) (hd0)

hide (hd0)