No you don't have to format your machine or loose your windows vista. Ubuntu can he installed on a different partition by partitioning your hard disk into two or more partitions.
 
Also ubuntu will create a GRUB boot loader, so that you can boot to your choice of operating system : Ubuntu Linux or your Windows vista.
 
Here are answers which will help you
 
How to install ubuntu on a windows xp system
 
How to install ubuntu on a windows machine

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2 years 11 weeks ago

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