clic droit sur le poste de travail => proprietés => Mettre à niveau Vista 
Windows Anytime Upgrade (WAU) lets customers upgrade to a more powerful – and more expensive – version of Vista by paying for and downloading a new activation key. WAU prices range from $79 (to upgrade from Home Basic to Home Premium) to $159 (from Home Premium to Ultimate) and $199 (Home Basic to Ultimate). TA JUSTE A DOWNLOADER WINDOWS “WINDOWS ANYTIME UPGRADE” SI TU NE LA PAS DÉJA DANS CONTROL PANEL … CEST UN PRIX STANDARD
Mais est ce que justement c’est pas le même prix que de faire une mise a jour de vista xp a vista prenium