I have a windows xp os, and I ve decided to give ubuntu a shot. I installed and It when rebooting it did boot by default windows. I red several forums and after entering those commands:

sudo mkdir /mnt/ubuntu
sudo mount /dev/sda2 /mnt/ubuntu
sudo grub-install /dev/sda --root -directory=/mnt/ubuntu

after rebooting the system showed me the command grub. And I cannot get anywhere. I don t have a windows cd to fix anything. so how can I launch windows from this command grub?

Thanks... I am in a real mess.