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Problems with transfer from camera to computer are usually either caused by
1: improper software configuration on the computer, usually a trifling matter of minor adjustment of settings, or
2: defects in the camera's interface electronics, or in the cable or the computer port that the camera is connecting with.
As for (2): is the camera recognized by the computer? can the computer 'see' it? if not, try a different USB port, or a different USB cable if that doesn't help.
As for (1): what happens when you connect the camera to the computer?