How to Download UBUNTU 12.04 LTS on windows xp for writting on a CD?

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http://askubuntu.com – Since I can't start my Internet on Ubuntu 8.04 LTS on laptop, I first want to download it on a CD on windows XP. How can I download it on a CD and than re-install on Laptop? I will format my laptop which has Ubuntu 8.04 LTS. Which poses lot of problems. Parag Shah (HowTos)