Thanks everyone. I have cured the problem by reloading the software.

Up to now the system has worked perfectly, but I haven't used the camera for some months and now have problems.

The camera will take pics, but won't download them as it did previously. I have recharged the batteries, but when I connect it to my computer nothing happens. I used to get the pics downloading automatically when I connected and switched it on.

Any help or suggestions would be appreciated. Thanks.