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In order for a USB port to accurately identify a newly attached device, the operating system must already possess the correct driver software for the device. That is, Windows has to be able to "see" what you're connecting before you connect it. While WinXP already has driver support for most USB device types, older versions of Windows (for example, Windows 98) typically require you to install drivers before attaching the USB device. If you're operating an older version of Windows, follow the device's installation instructions and install any drivers needed for the USB device before attaching it. Once the drivers are installed, you may need to reboot the PC. Try attaching the USB device. Windows should now see it properly. If you're working with a newer WinXP computer, you probably do not need to install any software in advance, but always double-check the device's installation instructions and try some troubleshooting. Try the device on a different PC if possible to verify that the device itself is working. Reboot your PC and try the USB device again—perhaps on a different USB port.