That's debatable. It depends on the specs. Vista and 7 require almost 1 GB of RAM just to operate. A program like CA would require almost another GB. So if it seems to be running slow or freezing at all that's why. Usually, but not always, XP systems were single core machines with right around 1-2 GB of RAM and fewer than 2 GHz. So it all depends on what you're running. If you're running a dual-core, 2x(1.9) GHz processor with 4 GB of RAM you'll be just fine if not better off.