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These symptoms occur because Windows XP does not include support for EHCI host controllers. To resolve this problem, obtain the latest service pack for Windows XP. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows XP Service Pack 1.== Does my PC have USB 2.0 ports? == Most desktop and laptop computers sold after 2002 are USB 2.0 enabled. USB 2.0 enabled means that the computer has one or more USB-enhanced host controllers. To determine if your computer running the Windows XP or Windows Server 2003 operating system has a USB-enhanced host controller, follow these steps:1. Start Device Manager. To do so, click Start, and then click Run. In the Open box, type devmgmt.msc, and then click OK.2. In the Device Manager window, expand the Universal Serial Bus controllers node. Look for a host controller with the word "Enhanced" in the title. If you find one, your system has USB 2.0 capable ports and has the necessary host controller drivers.3. If you do not find an enhanced host controller in step 2, expand the Other Devices section. Look for Universal Serial Bus (USB) Controller. If you find this item, your system has USB 2.0 capable ports, but you need to install drivers for this host controller. If you do not find this item, your system does not have any USB 2.0 ports.Remember, Windows 2000 and Windows XP were released before USB 2.0 hardware was available, so the drivers were released for those operating systems in the service packs.