Yes, lightroom for PLUGGING IT IN
Lightroom is a photo management program from Adobe. You probably have photos on your dongle, Lightroom is trying to sync them. Since your demo (or whatever) is expired, this process fails. What you should do is uninstall the program.
If you don't feel like dealing with that yet, ignore it. Go into My Computer and your dongle will be one of the drives listed. (Depending on your setup, it may be the "F:" drive.) Copy pasta stuff into that. (You can also drag-and-drop.)