Its true... you really need Core Duo at least. They are cheap. Go buy one. Pentium 4 no more. XP no more. Have 2 gb of 667 5400 mhz of DDR2 . Vista has arrived and all of people that think Windows XP is their refuge are losing it. Vista will lead to Vienna. All the service packs for Vista will lead to Vienna and not XP. I would get Core2Duo and not Core Duo and really T5600 or higher if your looking at a Laptop. I just got my laptop with XP a month ago and just completed the Upgrade to Vista Home Premium. There will be no return to XP. Why would I. Vista is by far and away better. But don't forget the 2 gb of 667 mhz 5400 memory, Thats a big one.