Recovery of grub in ubuntu 7.04

[Sauro Cesaretti]

Hello everyone,

I need to recover the grub configuration in ubuntu 7.04.
Before,I had ubuntu 7.04 installed together with windows xp.
This is my situation:
In the first partition I had win xp, in the second partition
I had one ntfs partition with data and
Then other 4 partitions (/boot,/,/home,swap) for linux.
I formatted the first partition and
I reinstalled xp again.
Now winxp removed  automatically the grub bootloader.
How can I recover it?
I tried to check some tutorials on the internet but I couldn't find
something that works correctly for my situation.
Thanks in advance,
Best regards, Sauro