Stucked in the grub command prompt

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http://askubuntu.com – 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. (HowTos)