Uninstall usbmon

Hello everybody,

I installed on computers "usbmon" to block USB devices.

But now , each time, when the users's session begins, windows scans devices on the computer. It detect devices ( usb device, hp webcam ). A message box [ "Landesk USB Monitor "appears  " ( usb device non authorized) ] "" . At the end, it invits me to reboot the system telling me it has finished to install devices.

But, Each  time at the beginning of the session,  it arrives the same thing

In my mind, I suppose, I have installed  too quickly usbmon before Windows detects all devices.

HOw can I uninstall usbmon ?

Thanks a lot !