I have two Dell computers, a laptop and a desktop. I reinstalled Windows XP home on both, from the same CD. Then I installed Service pack 3 and ran windows update. When I connect my Creative Zen media player to the desktop, the MTP software that is part of XP recognizes it, and I can copy file to and from it using Windows Explorer. But when I connect the same player with the same cable to the laptop, I can see it in Windows Explorer, but none of the folders that are visible via the desktop are available, and I can't copy anything to or from it. How can I get this working on the laptop?