SOURCE: how want to downgrade win vista to xp pro hp compaq v3000
If you have a Windows XP Pro installation disk, put it in the optical drive, restart your computer, on startup, go to BIOS settings (usually press [Delete] and set the optical drive as first boot device. Save changes and exit. When the computer starts it usually says to press any key to start from CD. Press any key and the windows installation will start. Make sure you format C: and you will downgrade to Windows XP Pro. If you want to upgrade to Vista again, you will need to know the keyboard sequence to start Vista from Its partition or have Vista install disk.
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