Such as camera default with Microsoft usbvideo. Sys driver, now that I myself wrote a driver (inf specified vid of its own equipment, pid)
If the usbvideo sys uninstall (very difficult, automatically reshipment, but I still think of some way to delete), my driver can normal installation, contains sys, inf, cat, cer, and driver can work properly.

. But if we don't delete usbvideo sys, directly in the device manager to update the device driver, choose my drive folder, only will be prompted to "detect the drive is the latest", and will not update my dedicated driver.

Excuse me. How can you not delete usbvideo sys when I drive, the success of the installation and the camera can use my driver directly.