install windows7 on pc with vista before installing win8

If I am reading the upgrade assistant info correctly, I would have to track down all my installation disks for apps even if they are compatible.

I never got around to putting windows 7 on a PC with VISTA, but I did buy it. Would it be worthwhile to upgrade to Windows 7 and then upgrade to windows 8.

E.g., Photoshop elements and Premiere Elements would be very expensive if I cannot find the disks.

I never got around to putting windows 7 on a PC with VISTA, but I did buy it. Would it be worthwhile to upgrade to Windows 7 and then upgrade to windows 8.

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No, but it would be worthwhile doing a clean install.
http://www.eightforums.com/tutorials/13375-clean-install-windows-8-upgrade.html