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If HP Win7 DVD will not boot to format Vista, then run it from Vista to install over Vista or to a second partition you create in Disk Management: Dual Boot Installation with Windows 7 and Vista
Later we can help you remove Vista if you want.
Make sure you have the BIOS boot order set to boot from DVD and try again: Boot from CD - How to Boot your Computer from a Bootable CD or DVD - Boot to CD
Look also for a Boot Menu shortcut key given on first bootup screen to trigger DVD drive.
Here are the steps for a clean install: Clean Install Windows 7
Last edited by gregrocker; 23 Jan 2010 at 12:01.