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Next time install the pen drive then watch the task bar beside the clock and wait for it to finish installing the software for the pen drive.
There should be a message beside the clock that tells you it is ready to use.
Also, please check the Device Manager and see if you have any ? or ! marks in there.
When a put de pendrive in the port usb, no message appears on the installation of the device.
Also, I checked Device Manager and the all device usb are working ok. ...All device are ok according to show the device manager