I've had similar problems with floppies & XP. I run a desktop with ME and recently bought laptop with XP. When I try swapping stuff betweent he two I find that only certain of my floppies will work with XP, yet they've been fine with ME. The only ones that work (in my experience) are TDKs MF-2HD that are also marked "MS-DOS Formatted". Found this by trial and error.