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 the computer. At this point, after the computer starts up, it will correctly detect the hardware and install the appropriate camera driver; if it is plug-and-play, try to directly connect the USB camera to one of the rear USB ports on the computer host so that the system can recognize it properly. Additionally, there is another phenomenon: although plug-and-play cameras can be recognized normally on XP, 2003, or higher versions such as Vista and Win2008, it does not mean they can also be recognized on the Win2000 system. Therefore, in this case, you can consider using a tool like "Driver Backup Expert" (both Windows Optimizer and Super Rabbit have this function) to back up the camera driver recognized in XP, and then load and install it on Win2000.