Windows XP First Look
You need, essentially, a new or extremely recent computer, 128MB of RAM (at least; our test laptop was decked out with 320MB), 2GB of free disk space, and, if you're upgrading, you must have Windows 98 or above. In fact, Microsoft says you'll have the best experience only if you buy a brand-new system with XP preinstalled. ... Unless you're planning to buy a new system when Windows XP hits the shelves, your XP experience likely won't be as smooth as Microsoft hopes. Though Windows XP may be, as Gates and company have said, the most important release since Windows 95, it's not an upgrade you should consider lightly