Boot Ubuntu having installed windows xp

[javiercmh]

hi,
I have Ubuntu 9.04 and Windows xp. One day, a virus attacked my computer, so, this time I decided to format my windows. When I installed it again, the menu with both operating systems didn't appear.

I am SURE Ubuntu it's still in my computer, but I don't know how to make it launch first (then, I will be able to choose what OS I want)

please help me and sorry for my english :), Javier.


note: I'm asking from Ubuntu Live CD...

[mikewhatever]

You need to reinstall GRUB boot loader, can be done from the live cd.
https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

[Nburnes]

Or you can change the boot.ini in Windows XP