Format my vista computer so it only runs linux

How to format my vista computer so it only runs linux?

Download a Linux iso and burn it on a CD. Boot from the CD and select "Use the whole hard drive" (or something on similar lines) while installing.

You will find a list of available distros here
http://distrowatch.com/

This one has a lot of multimedia codecs, flash, java and other software pre-installed
http://linuxmint.com/