New
#11
If you want a clean install then you can skip installing Vista first as there is a workaround to install when no previous OS is on the drive. http://community.winsupersite.com/bl...he-answer.aspx
However you need to own an XP/Vista to qualify for the Upgrade, and then according to the EULA that XP/VIsta is not usable. Keep your XP/Vista license key with the Upgrade key for the life of the UPgrade in case the issue should arise during reinstalls.
Reinstalls will never again be necessary however if you use Win7's excellent new Backup Imaging to save externally an image of your finished job, which can be reimage onto the same HDD (or a replacement) using the Installer's Repair my Computer console in 15 minutes.