no need to use a windows disk,
all you need is a bootable ubuntu live cd (or any linux live cd), i assume you have tried this
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I made a ubuntu disk from the website. when in my computer at start-up it does nothing
what you need to do is make sure your cd/dvd drive is first boot device in your bios, or, alternatively, use your boot options key (if you have one) and choose cd rom,
follow the instructions for install when you boot from the live cd and one of the options will be 'erase and use the whole disk' (or words to that effect)