I currently have Windows Vista Home Edition, and have bought Vista Ultimate. How do I upgrade from one to the other? Is it possible? (I really am not up to a clean install)

If your Vista Ultimate is retail version, not OEM, then start your PC and boot into Vista Home Premium. Then pop your Vista Ultimate DVD into the DVD-ROM tray and close the tray. If autorun of your DVD-ROM drive is not disabled, a couple of seconds later you will see a menu on the monitor. If Vista DVD does not start automatically, with Windows Explorer, look into the DVD and click Setup.exe to start installation. You will see the same menu on the monitor as above. Choose Install Vista. Then you will be given some options: Upgrade or Advanced. I do not remember the exact options. If you do not see " Upgrade " as one of the options, just quit. Regards SuatCINI

It's also worth pointing out that during the up grade you will be asked if you want an upgrade or a clean install , a clean install leaves a folder called win.old to retrieve data from.

My problem is that my legal copy Vista Ultimate says that upgrade has been disable. I do not quite remember why it said it, but whatever it was I had no indication of how to enable it.