In general, USB devices are easy to install. Many, like Zip drives, have the software already configured in Windows XP. In that case, all you need to do is plug the cables into the correct ports and turn everything on. With cameras, scanners, etc, make sure to check the manual that came with the device. Some USB devices can be plugged in while the computer is on, while others need everything to be turned off first. Also, some devices prefer that you run their setup disk before plugging them in. Others need you to plug them in first. When in doubt, check the device's manual.