First, if the camera is not plug-and-play, install the driver for the camera first, then restart your computer and plug the USB camera into one of the rear USB ports on your computer. At this point, after the computer starts up, it will correctly detect the hardware and install the appropriate camera driver. If the camera is plug-and-play, try plugging the USB camera directly into one of the rear USB ports on your computer to allow the system to recognize it properly. Additionally, there is another phenomenon: the plug-and-play camera can be recognized normally on XP, 2003, or higher versions like Vista and Win2008, but that doesn't necessarily mean it will also be recognized on the Win2000 system. In this case, you can consider backing up the camera driver that is recognized in XP using "Driver Backup Expert" (this feature is available in tools like Windows Optimizer or Super Rabbit), and then install the backed-up driver on Win2000.