Canon EOS 400D Camera PTP Twain Driver 1.3.0 Publisher's description
Canon EOS 400D Camera PTP Twain Driver 1.3.0
This software enables a PC to communicate with a camera when the communication mode in the camera is set to [Print/PTP] mode. During the PTP communication, you can not use remote shooting by the EOS Capture software.
It is highly recommended to always use the most recent driver version available.
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Try to set a system restore point before installing a device driver. This will help if you installed a wrong driver. Problems can arise when your hardware device is too old or not supported any longer.