When use it with "/PAE", on opening the camera, all usb deivices stop work, such as usb mouse, usb keyboard. But the "Terminal Services" still work , so I can connect to it. When I remove the "/PAE" option from boot.ini , it work well. I've try to use XPSP3's usbvideo.sys , it not work with "/PAE" too. The usbvideo.sys version is 5.2.3790.3959. Is there any patch to this file?