will not 'Copy To'

>I am attempting to use Windows Picture and Fax Viewer which is a part of
> WinXP Home to view some images (big JPGs, about 3MB each) I have
> downloaded
> onto my PC from my digital camera. I can view them OK but if I attempt to
> do
> anything with them I am prevented. For example, some need to be rotated
> through 90 degrees clockwise. If I do this using the button at the bottom
> of
> the screen then the image rotates and looks fine. If I try to store the
> rotated image I am prevented and given the following error message -
>
> "Failed to save to the specified location. Make sure the file is not
> write-protected and there is enough space on the drive to save the image.
> Copy To Aborted."
>
> Even if I do not rotate the image but just try to re-save it to a new
> location I get the same error message.
>
> Needless to say the files are not write protected and there is plenty of
> space. I have absolutely no idea why it is doing this. I would appreciate
> any advice. Thanks in advance. Please reply to the group.
>
>