I bought the Vista Premium edition after I ran the Vista test to see if my computer would work on it. It said that i was readt to go. I installed Vista. It said I had no sound card, It would not let me on the internet, either with land line or my wireless connection. Many other programs would not work. I called Microsoft, they had no idea what to do. They suggested I call HP. I called HP told them the problem, I now had a computer, that the only thing on it that ran was Vista. Vista also blocks the recovery partion and won't let you go back to XP. Since my warranty with HP was still infect they sent me 9 recovery disks for no charge. Thanks to HP I now have a computer again. I don't advise any one to by this unless you are buying a new computer. I would wait at least a year to buy in then so all the manufactures have the drives for Vista. Many still don't have those drives available. I bought it at Amozon.com and after explaining the situation and giving them my Microsoft case number, were they could not fix the problems, they refunded my money. I have a very fast computer with 2GIG memory and a 250MB video card and a sound blaster sound card. Yet nothing worked even though the Microsoft test said every thing was okay. WARNING DON"T UPGRADE.