My camera is conected with

It's very hard to troubleshoot software problems online, and it likely is a software issue. But why put up with the headaches of bad software in the first place? Please see the following blog article, as it describes the use of a card reader as a much easier, faster, and less error prone way to download your photos. In fact there are several important reasons discussed in the article for using a card reader vice downloading from the camera. USB Card readers are also very inexpensive these day, with cost virtually not an issue:

http://camerarepair.blogspot.com/2009/01/how-do-i-download-photos-or-pictures.html